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# Nonlinear Physics

27.07.2022
17:30 Forced symmetry breaking as a mechanism for rogue bursts in a dissipative nonlinear dynamical lattice

Author(s): P. Subramanian, E. Knobloch, and P. G. KevrekidisA ring of coupled oscillators can form rogue waves, large-amplitude bursts that are localized in space and time. This paper provides an alternative mechanism for the formation of rogue waves in a dissipative nonlinear lattice system, and describes the effect of varying the coupling strength. [Phys. Rev. E 106, 014212] Published Wed Jul 27, 2022

11:43 Neuromorphic computing with optically driven nonlinear fluid dynamics

Liquid film can function as optical memory, enabling new architectural horizons for nanoscale neuromorphic computing.

26.07.2022
17:30 Asymmetry and nonlinearity of current-bias characteristics in superfluid–normal-state junctions of weakly interacting Bose gases

Author(s): Shun UchinoThis paper investigates transport characteristics in superfluid–normal-state junctions with a weakly interacting Bose gas. The author finds a rectification effect intrinsic to such junction systems. [Phys. Rev. A 106, L011303] Published Tue Jul 26, 2022

17:30 Nonlinear nonreciprocal transport in antiferromagnets free from spin-orbit coupling

Author(s): Satoru Hayami and Megumi YatsushiroRelativistic spin-orbit coupling is a fundamental source of nonlinear nonreciprocal transport. It has been believed that large spin-orbit coupling is necessary to cause nonlinear nonreciprocal transport, which strongly narrows down candidate materials. Here, the authors theoretically propose an alternative mechanism of nonlinear nonreciprocal transport using local spin scalar chirality instead of spin-orbit coupling. They demonstrate two types of nonlinear nonreciprocal transport and clarify their microscopic parameter conditions. The findings significantly promote emergent noncentrosymmetric physics in the magnetic phase. [Phys. Rev. B 106, 014420] Published Tue Jul 26, 2022

25.07.2022
22:03 Researchers propose neuromorphic computing with optically driven nonlinear fluid dynamics

Sunlight sparkling on water evokes the rich phenomena of liquid-light interaction, spanning spatial and temporal scales. While the dynamics of liquids have fascinated researchers for decades, the rise of neuromorphic computing has sparked significant efforts to develop new, unconventional computational schemes based on recurrent neural networks, crucial to supporting wide range of modern technological applications, such as pattern recognition and autonomous driving. As biological neurons also rely on a liquid environment, a convergence may be attained by bringing nanoscale nonlinear fluid dynamics to neuromorphic computing.

16:53 Present and future of nonlinear optical metasurfaces

One of the main objectives of optics is the control of light propagation and confinement. Progress in optics historically started with the development of bulky lenses and mirrors, then prisms and gratings, and so on. The improvement of these devices slew down as the diffraction limit was approached. Nanophotonics aims at manipulating electromagnetic waves at sub-wavelength scale to go beyond this limit. The recent evolution of fabrication technologies, numerical tools and theoretical models opened the way to novel devices with unprecedented performances.

18.07.2022
18:30 Microscopic theory of thermalization in one dimension with nonlinear bath coupling

Author(s): A. Rodin, B. A. Olsen, M. Choi, and A. TanNumerical simulations of classical equations of motion reveal that a single coupling to an infinite chain is sufficient to induce thermalization. [Phys. Rev. Research 4, 033057] Published Mon Jul 18, 2022

08.07.2022
01:00 Publisher Correction: Nonlinear mechanics of human mitotic chromosomes

01.07.2022
16:53 Characterizing the materials for next-generation quantum computers with nonlinear optical spectroscopy

Researchers at the Department of Physics and the Cluster of Excellence "CUI: Advanced Imaging of Matter" of Universität Hamburg and the University of California at Irvine have recently proposed a new way to characterize topological superconductors by means of multi-THz-pulse experiments.

30.06.2022
17:23 Review discusses using nonlinear optics with structured light

Light can be tailored, much like cloth, weaving and stitching a pattern into the very fabric of light itself. This so-called structured light allows us to access, harness and exploit all light's degrees of freedom, for seeing smaller in imaging, focusing tighter in microscopy and packing more information into light for classical and quantum communications. In their study published in Opto-Electronic Advances, the authors showcase the recent advances in replacing the traditional linear optical toolkit with nonlinear control.

21.06.2022
17:30 Nonlinear Phototaxis and Instabilities in Suspensions of Light-Seeking Algae

Author(s): Aina Ramamonjy, Julien Dervaux, and Philippe BrunetA population of photosynthetic algae has been shown to exhibit a highly nonlinear response to light, forming dynamic structures in light-intensity gradients. [Phys. Rev. Lett. 128, 258101] Published Tue Jun 21, 2022

16.06.2022
19:23 Intrinsic optical nonlinearities and carrier dynamics of InSe

Recently, researchers in Shanghai Institute of Optics and Fine Mechanics (SIOM) of the Chinese Academy of Sciences carried out a systematic investigation on the microscopic optical nonlinearities and transient carrier dynamics in Indium Selenide (InSe) Nanosheet. Related research results were published in Optics Express on May 9, 2022.

01.06.2022
21:33 Researchers Observe Functional Nonlinear Optical Nanoparticles Synthesized by Laser Ablation

Functional nonlinear optical nanoparticles created by laser ablation have been discussed in a recent publication from Opto-Electronic Science. Various types of nonlinear optical nanoparticles...

16:23 Topologically tuned terahertz on a nonlinear photonic chip

Compact terahertz functional devices are highly useful for high-speed wireless communication, biochemical sensing and non-destructive inspection. However, controlled terahertz generation, alongside transport and detection is challenging for chip-scale devices, due to low coupling efficiency and absorption losses. In a new report now published in Nature: Light Science & Applications, Jiayi Wang, Shiai Xia and Ride Wang and a team of researchers in physics, biophysics, and nonlinear photonics, at the Nankai University, China and INRS-ENT, Canada, generated nonlinear and topologically tuned confinement of terahertz waves in an engineered lithium niobate chip. The team experimentally measured the band structures to provide direct visualization of the terahertz localization in the momentum space. The outcomes provide new possibilities to realize terahertz integrated circuits for advanced photonic applications.

31.05.2022
16:13 Functional nonlinear optical nanoparticles synthesized by laser ablation

Nonlinear optics is an important research direction with various applications in laser manufacturing, nanostructures' fabrication, sensor design, optoelectronics, biophotonics, and quantum optics, etc. Nonlinear optical materials are the fundamental building blocks, which are critical for broad fields ranging from scientific research, industrial production, to military. After many years of development, nonlinear optics has become the pillars for various frontier research and widely used optical systems, including laser fabrication, optical imaging, information processing & communications, as well as nanoscale lithography. Advances in this topic can potentially boost many disciplines.

27.05.2022
17:30 Periodic Wave Trains in Nonlinear Media: Talbot Revivals, Akhmediev Breathers, and Asymmetry Breaking

Author(s): Georgi Gary Rozenman, Wolfgang P. Schleich, Lev Shemer, and Ady ArieBy measuring the propagation dynamics of surface gravity water waves, the absence of fractional Talbot-effect due to interference of the periodic wavepackets in a nonlinear medium is observed. [Phys. Rev. Lett. 128, 214101] Published Fri May 27, 2022

23.05.2022
17:07 Novel DNA robots designed for swarming into nonlinear amplification

Researchers propose two conceptual models of intelligent DNA robots that can swarm into leakless nonlinear amplification when triggered.

18.05.2022
18:30 Nonlinear terahertz transmission spectroscopy on Ga-doped germanium in high magnetic fields

Author(s): Bence Bernáth, Papori Gogoi, Andrea Marchese, Dmytro Kamenskyi, Hans Engelkamp, Denis Arslanov, Britta Redlich, Peter C. M. Christianen, and Jan C. MaanThe authors report the observation of cyclotron resonance transitions of holes in the magnetotransmission spectra of gallium-doped germanium at low temperatures, using intense, pulsed terahertz free-electron laser radiation with a photon energy lower than the ionization energy of the Ga dopants. The spectra are very sensitive to THz intensity and provide compelling results about ionization mechanisms and saturation of Landau level transitions. The spectroscopy technique introduced here offers an exciting perspective for researching nonlinear magneto-optical processes in semiconductors. [Phys. Rev. B 105, 205204] Published Wed May 18, 2022

13.05.2022
21:30 Computational Verification and Experimental Validation of the Vibration-Attenuation Properties of a Geometrically Nonlinear Metamaterial Design

Author(s): Kyriakos Alexandros Chondrogiannis, Andrea Colombi, Vasilis Dertimanis, and Eleni ChatziMetamaterials continue to be conceptually intriguing for the manipulation of propagating waves. However, preventing low-frequency wave propagation proves to be challenging, due to limited metamaterial dimensions and mass. This study focuses on a metamaterial lattice featuring geometrically nonlinear behavior that can lead to negative stiffness, aimed at overcoming the requirement of large mass for low-frequency vibration attenuation. This approach can find application in structural engineering to protect against low-frequency excitations—such as earthquakes. [Phys. Rev. Applied 17, 054023] Published Fri May 13, 2022

04.05.2022
18:40 Nonlinear mechanics of human mitotic chromosomes

03.05.2022
17:30 Prediction and manipulation of hydrodynamic rogue waves via nonlinear spectral engineering

Author(s): Alexey Tikan, Felicien Bonnefoy, Giacomo Roberti, Gennady El, Alexander Tovbis, Guillaume Ducrozet, Annette Cazaubiel, Gaurav Prabhudesai, Guillaume Michel, Francois Copie, Eric Falcon, Stephane Randoux, and Pierre SuretIn this work, we realize the mathematically predicted universal mechanism of the local emergence of Peregrine solitons in water tank experiments, with a particular aim to control the point of the soliton occurrence in space-time by employing the inverse scattering transform for the synthesis of the initial data. Using this approach, we are able to engineer a localized wave packet with a prescribed solitonic and radiative content, evolving in a rogue wave at a predicted position from the wave maker. [Phys. Rev. Fluids 7, 054401] Published Tue May 03, 2022

27.04.2022
17:31 Shear-Driven Solidification and Nonlinear Elasticity in Epithelial Tissues

Author(s): Junxiang Huang, James O. Cochran, Suzanne M. Fielding, M. Cristina Marchetti, and Dapeng BiA minimal cell-based computational model demonstrates that fluid-like epithelial tissues become rigid above a critical applied strain, a process similar to shear-driven rigidity in other soft matter systems. [Phys. Rev. Lett. 128, 178001] Published Wed Apr 27, 2022

18.04.2022
17:30 Nonequilibrium fluctuations and nonlinear response of an active bath

Author(s): Hunter Seyforth, Mauricio Gomez, W. Benjamin Rogers, Jennifer L. Ross, and Wylie W. AhmedThe authors study the motion of an optically-controlled particle moving through an active bath and observe several regimes on the basis of the Peclet number. [Phys. Rev. Research 4, 023043] Published Mon Apr 18, 2022

13.04.2022
18:50 Nonlinear control of transcription through enhancer–promoter interactions

12.04.2022
18:30 Surface plasmon driven enhancement of linear and nonlinear magneto-optical Kerr effects in bimetallic magnetoplasmonic crystals in conical diffraction

Author(s): V. B. Novikov, A. M. Romashkina, D. A. Ezenkova, I. A. Rodionov, K. N. Afanasyev, A. V. Baryshev, and T. V. MurzinaNowadays, control of light based on the manipulation of surface plasmon polaritons (SPPs) in plasmonic crystals becomes a cornerstone of photonics. The authors study the SPP-driven enhancement of linear and nonlinear magneto-optical effects in magnetoplasmonic crystals (MPCs) based on corrugated gold and ferromagnetic films. A signature of the considered MPCs is the magnetic anisotropy mediated by the surface profile of a thin ferromagnetic layer, which allows to intertwine plasmonic effects with nonuniform magnetization, providing an extra venue for control of magneto-optical effects. [Phys. Rev. B 105, 155408] Published Tue Apr 12, 2022

08.04.2022
18:00 Controlling Nonlinear Interaction in a Many-Mode Laser by Tuning Disorder

Author(s): Yaniv Eliezer, Simon Mahler, Asher A. Friesem, Hui Cao, and Nir DavidsonThe number of lasing modes increases as the characteristic scale of random phase fluctuation decreases in a degenerate cavity, providing a tunable platform for investigating many-body phenomena. [Phys. Rev. Lett. 128, 143901] Published Fri Apr 08, 2022

17:32 Reconstructing the States of a Nonlinear Dynamical System

Researchers develop a new method to predict how complex nonlinear systems change over time. We often encounter nonlinear

07.04.2022
23:14 Bentley Systems acquires ADINA for nonlinear simulation capabilities

22:50 Reconstructing the states of a nonlinear dynamical system

We often encounter nonlinear dynamical systems that behave unpredictably, such as the earth's climate and the stock market. To analyze them, measurements taken over time are used to reconstruct the state of the system. However, this depends on the quality of the data. Now, researchers have proposed an all-new method for determining the necessary parameters that results in an accurate reconstruction. Their new technique has far-reaching implications for the field of data science.

21:42 Reconstructing the states of a nonlinear dynamical system

We often encounter nonlinear dynamical systems that behave unpredictably, such as the Earth's climate and the stock market. To analyze them, measurements taken over time are used to reconstruct the state of the system. However, this depends on the quality of the data. Now, researchers from Japan have proposed an all-new method for determining the necessary parameters that results in an accurate reconstruction. Their new technique has far-reaching implications for the field of data science.

31.03.2022
20:00 Nonlinear spectroscopy of excitonic states in transition metal dichalcogenides

Author(s): Yaroslav V. Zhumagulov, Vyacheslav D. Neverov, Alexander E. Lukyanov, Dmitry R. Gulevich, Andrey V. Krasavin, Alexei Vagov, and Vasili PerebeinosMethods in nonlinear optics attract much interest because they capture physical effects beyond linear spectroscopy. Here, the authors demonstrate that second harmonic generation (SHG) can be used to investigate details of the many-body effects, particularly the structure of excitonic states in low-dimensional materials. The dependence of the SHG signal on the polarization angle changes qualitatively with the frequency and intensity of the excitation light, which allows users to employ SHG to probe the fine structure of strongly bound excitonic states. [Phys. Rev. B 105, 115436] Published Thu Mar 31, 2022

24.03.2022
17:17 Optical nanoscopy to need fewer photons with nonlinear response

Scientists theorized that by doubling the gradient, they would increase the precision of optical nanoscopy by a factor of two or decrease the number of photons needed by a factor of four.

22.03.2022
21:22 Novel quantum sensing possibilities with nonlinear optics

Researchers used the nonlinear optical response of atom-like defects in a diamond to build a tiny thermometer. This research may lead to temperature sensors that can work inside living cells and other nanoscale applications.

18:35 Novel quantum sensing possibilities with nonlinear optics of diamonds

Scientists from the Faculty of Pure and Applied Sciences at the University of Tsukuba have developed a method for monitoring the temperature using the naturally occurring atom-like defects in diamonds. They found that increased heat led to reduced intensity of the nonlinear harmonic generation of light. This work may lead to highly accurate nano-sized thermometers.

18:04 Chiral anomaly induced nonlinear Nernst and thermal Hall effects in Weyl semimetals

Author(s): Chuanchang Zeng, Snehasish Nandy, and Sumanta TewariThe chiral anomaly (CA) is one the most remarkable topological properties in Weyl semimetals (WSMs). Here, the authors investigate the second-order nonlinear planar Nernst and thermal Hall effects in WSMs, manifested by thermal CA with coplanar thermal gradient and magnetic field. With intrinsic chiral chemical potential, these nonlinear effects can exist in WSMs with pairs of oppositely tilted or nontilted Weyl cones. Interestingly, their transport coefficients follow novel fundamental relations consistent with that of Berry-dipole-induced nonlinear effects. [Phys. Rev. B 105, 125131] Published Tue Mar 22, 2022

11:06 Novel quantum sensing possibilities with nonlinear optics

Researchers study the effects of temperature on the nonlinear optical response of nitrogen-vacancy defects in a diamond, which may lead to new heat detection methods for nanotechnology devices.

08.03.2022
01:52 Physicists discover method for emulating nonlinear quantum electrodynamics in a laboratory setting

On the big screen, in video games and in our imaginations, lightsabers flare and catch when they clash together. That clashing, or interference, happens only in fiction -- and in places with enormous magnetic and electric fields, which happens in nature only near massive objects such as neutron stars. A team of physicists has discovered discovered that it is possible to produce this effect in a laboratory setting, using a class of novel materials.

04.03.2022
12:04 Physicists discover method for emulating nonlinear quantum electrodynamics in a laboratory setting

On the big screen, in video games and in our imaginations, lightsabers flare and catch when they clash together. In reality, as in a laser light show, the beams of light go through each other, creating spiderweb patterns. That clashing, or interference, happens only in fiction—and in places with enormous magnetic and electric fields, which happens in nature only near massive objects such as neutron stars. Here, the strong magnetic or electric field reveals that a vacuum isn't truly a void. Instead, when light beams intersect here, they scatter into rainbows. A weak version of this effect has been observed in modern particle accelerators, but it is completely absent from our daily lives or even normal laboratory environments.

28.02.2022
21:00 Heat transport in nonlinear lattices free from the umklapp process

Author(s): Kazuyuki Yoshimura, Yusuke Doi, and Tomoya KitamuraThe authors develop a model that illustrates the role of umklapp processes in one-dimensional heat transport phenomena. They verify Peierls’ well-known hypothesis that only umklapp processes cause thermal resistance, and provide a starting point for understanding the emergence of this resistance. [Phys. Rev. E 105, 024140] Published Mon Feb 28, 2022

23.02.2022
19:00 Ultrastrong coupling of a qubit with a nonlinear optical resonator

Author(s): Fabio Mauceri, Alberto Mercurio, Salvatore Savasta, and Omar Di StefanoThe authors study the quantum Rabi model in the ultrastrong regime in the presence of cavity nonlinearities and identify inconsistencies from various nonlinear Hamiltonians. To resolve the issues, the authors develop a microscopic theory and provide a consistent nonlinear-resonator quantum Rabi model satisfying the gauge principle. [Phys. Rev. A 105, 023719] Published Wed Feb 23, 2022

17.02.2022
20:00 Drive-induced nonlinearities of cavity modes coupled to a transmon ancilla

Author(s): Yaxing Zhang, Jacob C. Curtis, Christopher S. Wang, R. J. Schoelkopf, and S. M. GirvinWhen microwave cavity modes and transmon qubits are coupled, the cavity modes inherit nonlinearity from the transmons. Here, the authors investigate how a driving field affects this nonlinearity, comparing analytical, numerical, and experimental results. They show that an off-resonant driving field can even be used to cancel the dominant nonlinearity, extending the time before a quantum state stored in the cavity suffers phase collapse. [Phys. Rev. A 105, 022423] Published Thu Feb 17, 2022

16.02.2022
20:01 Quantized Nonlinear Conductance in Ballistic Metals

Author(s): C. L. KaneThe quantized conductance of a two-dimensional electron gas can reflect its Fermi surface topology. [Phys. Rev. Lett. 128, 076801] Published Wed Feb 16, 2022

26.01.2022
19:00 Exact quantum scars in the chiral nonlinear Luttinger liquid

Author(s): Frank Schindler, Nicolas Regnault, and B. Andrei BernevigWhile the chiral linear Luttinger liquid is integrable via bosonization, its nonlinear counterpart does not admit of an analytic solution. Nonetheless, the authors find a number of exact eigenstates for a large family of density-density interaction terms. These quantum many-body scar states are embedded in a continuum of strongly correlated excited states. They exhibit identically zero momentum-space entanglement. Among other properties, this sets them apart from many previous examples of quantum many-body scars. [Phys. Rev. B 105, 035146] Published Wed Jan 26, 2022

24.01.2022
19:28 Novel mathematical models illuminate light propagation in nonlinear optical fibers

Data traffic is rapidly growing and can soon overload the current internet infrastructure. The key to solve this overload problem is to improve the data transmission over optical fibers. Vinicius Oliari defended his Ph.D. on new, more accurate mathematical tools to better understand how light propagates through optical fibers the high power, nonlinear regime. These tools are an important step to the development of new transceiver structures that will improve transmission in optical fibers.

21.01.2022
18:41 A nonlinear-transport perspective of field-induced phase transitions in pentatellurides

Combining topological states of matter with strong electron correlation promises many exotic phenomena such as charge fractionalization, excitonic instability, and axionic excitation. Layered transition-metal pentatellurides ZrTe5 and HfTe5 were found to be close to an accidental topological semimetal phase with low carrier density. Even in a relatively low magnetic field, they can form highly degenerated Landau levels and dramatically enhance the correlation effect of Dirac electrons therein. Therefore, these pentatellurides are good candidates for tunable correlated topological states. This phenomenon was examined in a recent study led by Prof. Faxian Xiu and Prof. Cheng Zhang from Fudan University.

12.01.2022
19:37 Publisher Correction: Giant modulation of optical nonlinearity by Floquet engineering

11.01.2022
17:34 Nonlinear effects of wind on Atlantic ocean circulation

The Atlantic Meridional Overturning Circulation (AMOC) is a system of ocean currents that transports warm, salty water from the tropics to the northern Atlantic. As the water cools, it becomes denser and sinks, in a process known as overturning. The cold deep water then flows back toward the equator. This process of transportation plays a critical role in Earth's climate.

05.01.2022
20:56 Resonant generation of electromagnetic modes in nonlinear electrodynamics: Classical approach

Author(s): Ilia Kopchinskii and Petr SatuninThe authors study the possibility of resonant amplification of electromagnetic modes generated by a nonlinear effect in Euler-Heisenberg electrodynamics. Notably, the authors show the absence of resonant amplification of the third harmonics and combined “plus” modes. These results could be useful for the possible measurements of the Euler-Heisenberg terms. [Phys. Rev. A 105, 013508] Published Wed Jan 05, 2022

03.01.2022
18:47 Breakthrough in the nonlinear generation of primordial gravitational waves

In a Physics Review Letters paper published on Dec 15th, an international research team, led by Cai Yifu, Professor of the University of Science and Technology of China, and his collaborators discovered the hypothetical possibility of resonantly generating primordial gravitational waves within the high energy physics when the universe was in the babyhood. The originally invisible gravitational wave signals can be amplified by parametric resonance by 4 to 6 orders of magnitude or even larger through this phenomenon, and then become likely to be probed by primordial gravitational wave detectors, hence, validating some theoretical models of the very early universe that are "inaccesible" in traditional observational windows.

08.12.2021
19:33 Giant modulation of optical nonlinearity by Floquet engineering

02.12.2021
15:01 Publisher Correction: Single-photon nonlinearity at room temperature

Nature is the international weekly journal of science: a magazine style journal that publishes full-length research papers in all disciplines of science, as well as News and Views, reviews, news, features, commentaries, web focuses and more, covering all branches of science and how science impacts upon all aspects of society and life.

15.11.2021
15:40 Nonlinear fundamental research of novel photonic devices with thickness control

Fiber lasers are widely used in the fields of optical communications, medical surgery, laser processing and lidar due to their advantages of good beam quality, compact structure, low cost and good compatibility. Therefore, they are considered to be one of the lasers with broad application prospects. On the other hand, with the further development of nanomaterial technology, two-dimensional materials with strong nonlinearity and fast relaxation process have gradually attracted widespread attention. So far, some two-dimensional materials have been successfully applied to fiber lasers as saturable absorbers and achieved ultrashort pulses.

12.11.2021
18:54 Fate of topological edge states in disordered periodically driven nonlinear systems

Author(s): Ken Mochizuki, Kaoru Mizuta, and Norio KawakamiThe authors show that topological edge states unique to periodically driven systems survive in the nonlinear regime and experience transitions between long- and short-lifetime regions. [Phys. Rev. Research 3, 043112] Published Fri Nov 12, 2021

12.10.2021
17:13 Observing hydrodynamic phenomena with light via analogy between quantum gases and nonlinear optics

A team of researchers from Friedrich-Schiller-University Jena, Universit di Trento and the University of Birmingham has developed a way to "listen" to sounds generated in a fluid of light. In their paper published in the journal Physical Review Letters, the group describes their work and its possible use as a new way to study fluids.

11.10.2021
18:03 Ultrafast nonlinear phonon response of few-layer hexagonal boron nitride

Author(s): Taehee Kang, Jia Zhang, Achintya Kundu, Klaus Reimann, Michael Woerner, Thomas Elsaesser, Bernard Gil, Guillaume Cassabois, Christos Flytzanis, Giorgia Fugallo, Michele Lazzeri, Ryan Page, and Debdeep JenaUltrafast optical-phonon dynamics and the related nonlinear lattice response of few-layer hexagonal boron nitride ( h -BN) are elucidated in a combined experimental and theoretical study. The lifetimes of transverse optical (TO) phonons and interlayer modes are 1.2 and 20 ps. In-plane TO phonon displacements are shown to couple to interlayer shear and breathing motions. In the nonlinear phonon response, a transient reduction of the TO phonon frequency arises from this anharmonic coupling, which is a particular property of few-layer

22.09.2021
19:05 Single-photon nonlinearity at room temperature

18:03 Nonlinear Dynamics in a Synthetic Momentum-State Lattice

Author(s): Fangzhao Alex An, Bhuvanesh Sundar, Junpeng Hou, Xi-Wang Luo, Eric J. Meier, Chuanwei Zhang, Kaden R. A. Hazzard, and Bryce GadwayInteraction effects are observed in a synthetic lattice of coupled atomic momentum states. [Phys. Rev. Lett. 127, 130401] Published Wed Sep 22, 2021

07.09.2021
18:57 Promoting global stability in data-driven models of quadratic nonlinear dynamics

Author(s): Alan A. Kaptanoglu, Jared L. Callaham, Aleksandr Aravkin, Christopher J. Hansen, and Steven L. BruntonModeling realistic fluid and plasma flows is computationally intensive, motivating the use of reduced-order models for a variety of scientific and engineering tasks. However, it is challenging to characterize, much less guarantee, the global stability (i.e., long-time boundedness) of these models. In this work, we illustrate how to modify the objective function in machine learning algorithms to promote globally stable data-driven models of fluid and plasma flows. This innovation significantly extends the applicability of sparse system identification for complex dynamics, such as models of turbulent boundary layers. [Phys. Rev. Fluids 6, 094401] Published Tue Sep 07, 2021

02.09.2021
17:44 Generating entangled photons with nonlinear metasurfaces

Quantum nanophotonics is an active research field with emerging applications that range from quantum computing to imaging and telecommunications. This has motivated scientists and engineers to develop sources for entangled photons that can be integrated into nano-scale photonic circuits. Practical application of nanoscale devices requires a high photon-pair generation rate, room-temperature operation, and entangled photons emitted at telecommunications wavelengths in a directional manner.

23.08.2021
18:54 Electric polarization and nonlinear optical effects in noncentrosymmetric magnets

Author(s): Takahiro Morimoto, Sota Kitamura, and Shun OkumuraMagnetic excitations in multiferroic materials accompany electric polarization, known as electromagnons. The authors develop here a general framework to study electric polarization and nonlinear optical responses of noncentrosymmetric magnets based on spin models. They theoretically demonstrate the optical excitation of electromagnon-induced dc current generation (i.e., a photovoltaic effect) from the so-called shift current mechanism. [Phys. Rev. B 104, 075139] Published Mon Aug 23, 2021

17.08.2021
18:03 Origin of the Sharkskin Instability: Nonlinear Dynamics

Author(s): Stylianos Varchanis, Dionisis Pettas, Yannis Dimakopoulos, and John TsamopoulosThe stretching and recoiling of polymer chains leads to the characteristic ridge pattern as a soft material exits a narrow nozzle. [Phys. Rev. Lett. 127, 088001] Published Tue Aug 17, 2021

06.08.2021
15:10 Theories predict 2D nanofluidic channels showing nonlinear conduction function as memory-effect transistors

A team of researchers at Sorbonne Université has developed a way to show 2D nanofluidic channels carrying out nonlinear conduction functions as memory-effect transistors, using theory and simulations. In their paper published in the journal Science, the group describes their work with aqueous electrolytes confined in a two-dimensional gap between graphite layers and what they learned from it. Yaqi Hou and Xu Hou with Xiamen University have published a Perspective piece in the same journal issue outlining work involved in replicating the ways that neurons communicate using ionic and neurotransmitter conduction, and the work done by the team in France.

04.08.2021
18:21 Quantized nonlinear Thouless pumping

02.08.2021
23:25 Author Correction: Quantum-enhanced nonlinear microscopy

09.06.2021
23:35 Achieving UV Nonlinearity with a Wide Bandgap Semiconductor Waveguide (Shannon Davis/Solid State Technology)

Shannon Davis / Solid State TechnologyAchieving UV Nonlinearity with a Wide Bandgap Semiconductor Waveguide - The field of ultrafast nonlinear photonics has now become the focus of numerous studies, as it enables a host of applications in advanced on-chip spectroscopy and information processing. The post Achieving UV Nonlinearity with a Wide Bandgap Semiconductor Waveguide appeared first on Semiconductor Digest. Despite the tremendous progress made in ...

19:11 Quantum-enhanced nonlinear microscopy

13:54 Achieving UV nonlinearity with a wide bandgap semiconductor waveguide

The field of ultrafast nonlinear photonics has now become the focus of numerous studies, as it enables a host of applications in advanced on-chip spectroscopy and information processing. The latter in particular requires a strongly intensity-dependent optical refractive index that can modulate optical pulses faster than even picosecond timescales and on sub-millimeter scales suitable for integrated photonics.

27.05.2021
18:02 Exact results for nonlinear Drude weights in the spin-$\frac{1}{2}$ XXZ chain

Author(s): Yuhi Tanikawa, Kazuaki Takasan, and Hosho KatsuraWhile the linear Drude weight in quantum many-body systems has been studied extensively, its nonlinear counterparts – called nonlinear Drude weights (NLDWs) – remain largely unexplored. Here, the authors present the first exact results for the NLDWs of the spin- 1 2 XXZ chain, a paradigmatic quantum many-body system. Their exact results based on the Bethe ansatz reveal that the NLDWs diverge with the system size in certain parameter regions. Also, the analytical expressions for the NLDWs are obtained when they converge. [Phys. Rev. B 103, L201120] Published Thu May 27, 2021

10.05.2021
18:56 Geometric Photon-Drag Effect and Nonlinear Shift Current in Centrosymmetric Crystals

Author(s): Li-kun Shi, Dong Zhang, Kai Chang, and Justin C. W. SongThe nonlinear shift current (associated with the bulk photovoltaic effect) in centrosymmetric crystals, known to be absent in crystals with inversion symmetry, could still be activated by a photon-drag effect. [Phys. Rev. Lett. 126, 197402] Published Mon May 10, 2021

17:59 Self-Organized Multifrequency Clusters in an Oscillating Electrochemical System with Strong Nonlinear Coupling

Author(s): Maximilian Patzauer and Katharina KrischerSelf-organized multifrequency clusters in n-doped silicon wafers emerge from a uniform oscillatory state during electrodissolution at low-intensity photoexcitation. [Phys. Rev. Lett. 126, 194101] Published Mon May 10, 2021

28.04.2021
19:48 Researchers use a nanoscale synthetic antiferromagnet to toggle nonlinear spin dynamics

Researchers have used a nanoscale synthetic antiferromagnet to control the interaction between magnons -- research that could lead to faster and more energy-efficient computers.

17:58 Researchers use a nanoscale synthetic antiferromagnet to toggle nonlinear spin dynamics

Researchers at the University of California, Riverside, have used a nanoscale synthetic antiferromagnet to control the interaction between magnons—research that could lead to faster and more energy-efficient computers.

06.04.2021
16:31 Investigating the interplay of topology and non-Hermitian physics with nonlinear effects

An international team of researchers has investigated the interplay of topology and non-Hermitian physics with nonlinear effects. In their paper published in the journal Science, the group describes contructing an optical waveguide lattice using a biased photorefractive crystal and experiments introducing nonlinear effects. Piotr Roztocki and Roberto Morandotti with INRS-Énergie, Matériaux et Télécommunications have published a Perspective piece in the same journal issue outlining the benefits of studying nonlinear systems and work by the team on this new effort.

05.04.2021
19:46 Nonlinear wave mixing facilitates subwavelength imaging

A team of researchers recently developed an alternative way to break the Abbe diffraction limit and realize subwavelength imaging in an all-optical manner. They propose localized evanescent-wave illuminations, which are excited at the silicon surface by four-wave mixing, a third-order nonlinear optical process.

19:39 Nonlinear wave mixing facilitates subwavelength imaging

The diffraction limit, also known as the Abbe diffraction limit in optics, poses a great challenge in many systems that involve wave dynamics, such as imaging, astronomy, and photolithography. For example, the best optical microscope only possesses resolution around 200 nm, but the physical size of the photolithography process with an excimer laser is around tens of nanometers. Meanwhile, physical sizes in current research and applications in biology and the semiconductor industry have scaled down to several nanometers, which is far beyond the ability of optical waves.

22.03.2021
19:54 Broadband Field Localization, Density of States, and Nonlinearity Enhancement in Nonreciprocal and Topological Hotspots

Author(s): Sander A. Mann, Ahmed Mekawy, and Andrea AlùNonlinear and quantum optics, and electromagnetic applications such as sensing, benefit from large, broadband electric field enhancements, which are usually achieved through localized resonances. That approach, however, involves a stringent compromise between field enhancement, bandwidth, and overall device size. Here the authors study the unusual phenomena arising at a n o n r e c i p r o

16:29 Diamond color centers for nonlinear photonics

Researchers from the Department of Applied Physics at the University of Tsukuba demonstrated second-order nonlinear optical effects in diamonds by taking advantage of internal color center defects that break inversion symmetry of diamond crystal. This research may lead to faster internet communications, all-optical computers, and even open a route to next generation quantum sensing technologies.

19.03.2021
18:27 High-efficiency pulse compression established on solitons in nonlinear Kerr resonators

Generating intense ultrashort pulses with high spatial quality has opened up possibilities for ultrafast and strong-field science. It is so important that the Nobel Prize in Physics 2018 was given to Dr. Strickland and Dr. Mourou for inventing a technique called chirped pulse amplification, which drives numerous ultrafast lasers worldwide. With the great advancement in the last decade, Yb-based ultrafast lasers have become highly popular, because they exhibit exceptional thermal efficiency, are low in cost and are highly flexible in adjusting pulse energies and repetition rates.

05.03.2021
17:50 Twistoptics: A new way to control optical nonlinearity

Engineering researchers report that they developed a new, efficient way to modulate and enhance an important type of nonlinear optical process: optical second harmonic generation -- where two input photons are combined in the material to produce one photon with twice the energy -- from hexagonal boron nitride through micromechanical rotation and multilayer stacking. Their work is the first to exploit the dynamically tunable symmetry of 2D materials for nonlinear optical applications.

01:11 Twistoptics—A new way to control optical nonlinearity

Nonlinear optics, a study of how light interacts with matter, is critical to many photonic applications, from the green laser pointers we're all familiar with to intense broadband (white) light sources for quantum photonics that enable optical quantum computing, super-resolution imaging, optical sensing and ranging, and more. Through nonlinear optics, researchers are discovering new ways to use light, from getting a closer look at ultrafast processes in physics, biology, and chemistry to enhancing communication and navigation, solar energy harvesting, medical testing, and cybersecurity.

04.03.2021
23:34 Twistoptics - A new way to control optical nonlinearity with 2D materials

Researchers engineer first technique to exploit the tunable symmetry of 2D materials for nonlinear optical applications, including laser, optical spectroscopy, imaging, and metrology systems, as well as next-generation optical quantum information processing and computing.

03.03.2021
19:10 Van der Waals heterostructure polaritons with moiré-induced nonlinearity

26.02.2021
11:32 New Insight into Nonlinear Optical Resonators Unlocks Door to Numerous Potential Applications

Optical resonators, which circulate and confine light (for instance in lasers), are currently used in a variety of

27.01.2021
19:53 Nonlinear Bell inequality for macroscopic measurements

Author(s): Adam Bene Watts, Nicole Yunger Halpern, and Aram HarrowThe authors prove an inequality usable to certify the presence of entanglement in noisy macroscopic systems. Violations of this inequality could potentially be observed experimentally. [Phys. Rev. A 103, L010202] Published Wed Jan 27, 2021

13.01.2021
19:15 Giant nonlinear optical responses from photon-avalanching nanoparticles

05.01.2021
20:00 New Quantum Algorithms Finally Crack Nonlinear Equations

Two teams found different ways for quantum computers to process nonlinear systems by first disguising them as linear ones.

14.12.2020
21:32 When less is more: A single layer of atoms boosts the nonlinear generation of light

Researchers show that structures built around a single layer of graphene allow for strong optical nonlinearities that can convert light.

21:05 When less is more: A single layer of atoms boosts the nonlinear generation of light

In a new study an international research team led by the University of Vienna has shown that structures built around a single layer of graphene allow for strong optical nonlinearities that can convert light. The team achieved this by using nanometer-sized gold ribbons to squeeze light, in the form of plasmons, into atomically-thin graphene. The results, which are published in Nature Nanotechnology are promising for a new family of ultra-small tunable nonlinear devices.

02.12.2020
20:25 Natural three-dimensional nonlinear photonic crystal

Nonlinear photonic crystals (NPCs) are transparent materials that have a spatially uniform linear susceptibility, yet a periodically modulated quadratic nonlinear susceptibility. These engineered materials are used extensively for studying nonlinear wave dynamics and in many scientific and industrial applications. Over the past two decades, there has been a continuous effort to find a technique that will enable the construction of three-dimensional (3-D) NPCs. Such capability will enable many new schemes of manipulation and control of nonlinear optical interactions.

01.12.2020
15:43 Nonlinear beam cleaning in spatiotemporally mode-locked lasers

In the last few decades, only temporal modes have been considered for mode-locked fiber lasers using single-mode fibers. Mode-locked single-mode fiber lasers offer advantages due to their high-gain doping, intrinsically single-spatial mode, and compact setups. However, in terms of power levels, mode-locked fiber lasers suffer from high nonlinearity, which is introduced by the small core size of the single-mode fibers. Researchers from École Polytechnique Fédérale de Lausanne, Switzerland (EPFL) recently developed a new approach for generating high-energy, ultrashort pulses with single-mode beam quality: nonlinear beam cleaning in a multimode laser cavity.

10.11.2020
20:01 Nonlinear trident in the high-energy limit: Nonlocality, Coulomb field, and resummations

Author(s): Greger TorgrimssonTrident production, where a high energy electron entering an intense laser field produces an additional electron-positron pair, is a nonlinear process in which QED becomes a strongly coupled, i.e. non-perturbative, theory. Motivated by plans for new trident production experiments like LUXE and FACET-II, this paper examines the conflicting predictions of the Weizsäcker-Williams and Locally Constant Field approximations. The author presents new results for understanding the high-energy, non-linear regime via novel approximation methods and modern resummation techniques. [Phys. Rev. D 102, 096008] Published Tue Nov 10, 2020

06.11.2020
16:22 Researchers develop nonlinearity-induced topological insulator

Researchers from the University of Rostock have developed a novel type of nonlinear photonic circuitry in which intense light beams can define their own path and, in doing so, render themselves impervious to external perturbations. This discovery was recently published in the renowned journal Science.

04.11.2020
19:16 A one hundred thousand-fold enhancement in the nonlinearity of silicon

A team of researchers led by Osaka University and National Taiwan University created a system of nanoscale silicon resonators that can act as logic gates for light pulses. This work may lead to the next generation of silicon-based computer processors that bridge the gap between electronic and optical signals.

11:21 100,000-fold enhancement in the nonlinearity of silicon

Researchers develop silicon nanoresonators that can control the scattering of light when excited by another laser. This research may lead to faster and completely optical computer switches and circuits.

18.09.2020
22:05 Quantum state engineering by nonlinear quantum interference

Author(s): Liang Cui, Jie Su, Jiamin Li, Yuhong Liu, Xiaoying Li, and Z. Y. OuThe success of many protocols in optical quantum information processing relies on the availability of photon states with a well-defined spatial and temporal mode, but the latter is often difficult to engineer. The authors present a new approach based on nonlinear interferometry that separates the nonlinear gain control from the dispersion engineering, resulting in photon pairs simultaneously possessing the advantages of high purity, high collection efficiency, high brightness, and flexibility in wavelength and bandwidth selection. [Phys. Rev. A 102, 033718] Published Fri Sep 18, 2020

15.09.2020
17:59 Evidence for Nonlinear Isotope Shift in ${\mathrm{Yb}}^{+}$ Search for New Boson

Author(s): Ian Counts, Joonseok Hur, Diana P. L. Aude Craik, Honggi Jeon, Calvin Leung, Julian C. Berengut, Amy Geddes, Akio Kawasaki, Wonho Jhe, and Vladan VuletićA signal predicted for a type of dark matter appears in the spectra of ytterbium isotopes. [Phys. Rev. Lett. 125, 123002] Published Tue Sep 15, 2020

11.09.2020
17:11 Nonlinear polyatomic molecule, CaOCH3 laser-cooled to ~700 mK

A team of researchers at Harvard University has developed a way to cool nonlinear polyatomic molecules to extremely cold temperatures. In their paper published in the journal Science, the group describes their method and possible uses for it. Eric Hudson with the University of California, Los Angeles, has published a Perspective piece in the same issue describing the decades-long history of work involved in attempting to cool complex molecules, and also outlines the work by the team in California.

20.07.2020
21:07 Generation of weakly nonlinear turbulence of internal gravity waves in the Coriolis facility

Author(s): Clément Savaro, Antoine Campagne, Miguel Calpe Linares, Pierre Augier, Joël Sommeria, Thomas Valran, Samuel Viboud, and Nicolas MordantThe oceans’ interior is stratified in density and thus can sustain internal wave propagation. These waves, when nonlinear, can generate a state of wave turbulence and contribute significantly to the global energy dissipation of ocean circulation. However, a full theoretical description of the statistical properties of such stratified turbulence is still being sought. We performed very large scale experiments in the Coriolis facility in Grenoble, France and observed a state of wave turbulence of internal waves, which will enable comparisons with theory and numerical simulations. [Phys. Rev. Fluids 5, 073801] Published Mon Jul 20, 2020

16.07.2020
16:43 Novel partial isovalent anion substitution induction strategy to design infrared nonlinear optical materials

Infrared nonlinear optical (IR–NLO) materials are crucial for a broad range of applications, such as signal communication, microscopy and data processing. Yet, the challenge is how to obtain a strictly structural non-centrosymmetric (NCS) compound, which is the primary requirement for the IR–NLO materials.

22.05.2020
17:38 Fast calculation of the nonlinear redshift-space galaxy power spectrum including selection bias

Author(s): Joseph Tomlinson, Henry S. Grasshorn Gebhardt, and Donghui JeongThis paper presents a fast implementation of the one loop calculation of the galaxy power spectrum in redshift-space, which leads to a speed up over more traditional multi-dimensional integration techniques by a few orders of magnitude. [Phys. Rev. D 101, 103528] Published Fri May 22, 2020

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