Article
Materials Science, Multidisciplinary
Jack Crewse, Thomas Vojta
Summary: The study focuses on the amplitude (Higgs) mode near the two-dimensional superfluid-Mott glass quantum phase transition. The introduction of disorder into the system leads to unconventional dynamical behavior of the Higgs mode that violates naive scaling. The computed spectral densities exhibit a broad, noncritical response for all energies, indicating strong evidence for the localization of the Higgs mode for all dilutions.
Article
Physics, Multidisciplinary
Thao Huong Pham
Summary: This study uses the functional integral method to investigate the field- and anisotropy-induced magnetic transitions, spin waves, and specific heat in a one-dimensional XYZ ferromagnet. The results reveal a double-peak structure in the temperature-dependent specific heat behavior and emphasize the role of thermal and quantum fluctuations.
Article
Materials Science, Multidisciplinary
T. Repplinger, S. Klimin, M. Geledan, J. Tempere, H. Kurkjian
Summary: We study the plasma branch of a homogeneous three-dimensional electron gas in an s-wave superconducting state. The dispersion and lifetime of plasmons are affected by the presence of the pair condensate. When the plasma frequency is close to the pair-breaking threshold, the plasma branch displays anomalous downward dispersion and a dispersion minimum lower than the plasma frequency. At high plasma frequencies, the plasmons damp out in pair-breaking excitations, acquiring a small damping rate at zero temperature.
Article
Multidisciplinary Sciences
L. V. Kulik, A. S. Zhuravlev, L. I. Musina, E. I. Belozerov, A. B. Van'kov, O. V. Volkov, A. A. Zagitova, I. V. Kukushkin, V. Y. Umansky
Summary: Researchers have formed a macroscopic quasi-equilibrium ensemble of neutral excitations - spin one anyon complexes in the Laughlin state nu = 1/3 experimentally, showing that the ensemble has such a long lifetime that it can be considered a new state of anyon matter. The properties of this state are investigated by optical techniques to reveal its Bose properties, indicating that a macroscopic ensemble of neutral excitations in the 1/3 state exhibits properties of a Bose system with an exceptionally long coherence time.
NATURE COMMUNICATIONS
(2021)
Article
Materials Science, Multidisciplinary
Wenjuan Zhang, Zachariah Addison, Nandini Trivedi
Summary: This study expands the concept of frustration to metals with flat bands, showing how electronic states are formed when interorbital hopping dominates over intraorbital hopping in a multiband system. The research demonstrates the evolution of electronic structure, Berry phase distributions, and optical absorption effects in a tight-binding model, providing a new mechanism for achieving flat bands in metallic phases.
Article
Chemistry, Physical
Konstantin M. Morozov, Piotr Pander, Larissa G. Franca, Alexey Belonovski, Elizaveta Girshova, Konstantin A. Ivanov, Daniil A. Livshits, Nikita Selenin, Galia Pozina, Andrew P. Monkman, Mikhail A. Kaliteevski
Summary: The properties of ultrastrongly coupled Tamm plasmon cavities filled with DPAVBi organic material were studied, confirming their operation in the ultrastrong coupling regime and the agreement between experimental results and theoretical models.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Optics
Rajamanickam Ravisankar, Henrique Fabrelli, Arnaldo Gammal, Paulsamy Muruganandam, Pankaj Kumar Mishra
Summary: This study presents the collective excitation spectrum analysis of binary Bose-Einstein condensates with spin-orbit and Rabi couplings, revealing the crucial role of SO and Rabi coupling strengths in determining the dynamical stability of coupled BECs. The results show that an increase in SO coupling leads to instability, while an increase in Rabi coupling stabilizes the system and generates different excitation modes.
Article
Multidisciplinary Sciences
Eslam Khalaf, Ashvin Vishwanath
Summary: This study predicts that spin polarons, bound states of an electron and a spin flip, can serve as charge carriers in the Chern-ferromagnet phase of twisted bilayer graphene. This exotic type of charge carrier has important implications in topological bands and may have potential experimental applications in materials like twisted bilayer graphene.
NATURE COMMUNICATIONS
(2022)
Article
Physics, Multidisciplinary
Timon A. Hilker, Lena H. Dogra, Christoph Eigen, Robert P. Smith, Zoran Hadzibabic
Summary: The two sounds in a highly compressible fluid are investigated using an ultracold Bose gas. The results show that only one sound persists at different temperatures, which is consistent with the hydrodynamic theory.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Condensed Matter
Van Men Nguyen, Kim Phuong Dong Thi
Summary: This paper investigates collective excitations in a heterostructure of silicene sheet and GaAs quantum well by considering exchange-correlation effects using the random-phase approximation. Two plasmonic modes are found, corresponding to in-phase and out-of-phase oscillations of charged particles in the two layers. The energy of both plasmon modes decreases due to the interactions between electrons in the two layers, which is different from other double-layer structures. The optical and acoustical modes' frequencies are greatly reduced by increasing the inter-layer separation.
PHYSICA B-CONDENSED MATTER
(2023)
Article
Physics, Multidisciplinary
Weiyao Ke, Yi Yin
Summary: We investigate the response of the near-equilibrium quark-gluon plasma (QGP) to perturbation at nonhydrodynamic gradients. We propose a conceivable scenario under which sound mode continues to dominate the medium response in this regime. Such a scenario has been observed experimentally for various liquids and liquid metals. We further show that this extended hydrodynamic regime (EHR) indeed exists for both the weakly coupled kinetic equation in the relaxation time approximation (RTA) and the strongly coupled N = 4 supersymmetric Yang-Mills (SYM) theory. We construct a simple but nontrivial extension of Muller-Israel-Stewart (MIS) theory-namely MIS*-and demonstrate that it describes the EHR response for both the RTA and SYM theory. This indicates that MIS* equations can potentially be employed to search for QGP EHR via heavy-ion collisions.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Multidisciplinary
Ammar Kirmani, Kieran Bull, Chang-Yu Hou, Vedika Saravanan, Samah Mohamed Saeed, Zlatko Papic, Armin Rahmani, Pouyan Ghaemi
Summary: This article introduces a method to study the geometric properties and graviton dynamics of fractional quantum Hall states using intermediate-scale quantum technologies. The authors simulate geometric quench and graviton dynamics on the IBM quantum computer and develop an efficient variational quantum algorithm for simulating graviton dynamics in larger systems.
PHYSICAL REVIEW LETTERS
(2022)
Article
Astronomy & Astrophysics
Stephen L. Adler
Summary: In this study, we combine the concepts of a Weyl scaling invariant dark energy action and the gravastar theory. By utilizing the Tolman-Oppenheimer-Volkoff equation, we investigate the structure and dynamics of gravastars. Our Mathematica notebooks demonstrate that the structural changes of gravastars are determined by the action and equation of state, and the radii at which these changes occur are not predetermined. Additionally, we calculate the effects of a very small black hole wind using a relativistic extension of standard pressure-driven isothermal stellar wind theory.
Article
Physics, Multidisciplinary
Amir Burshtein, Roman Kuzmin, Vladimir E. Manucharyan, Moshe Goldstein
Summary: Recent advances in circuit quantum electrodynamics have enabled the observation of inelastic collisions between single microwave photons and instantons, offering insights for research in other quantum field theoretical contexts. The study also indicates that the inelastic scattering probability can significantly exceed the impact of conventional Josephson quartic anharmonicity and mach order-unity values.
PHYSICAL REVIEW LETTERS
(2021)
Article
Optics
Peng Xu, Wenxian Zhang
Summary: A generalized Mathieu equation (GME) is proposed to describe the dynamics of two different models in spin-1 Bose-Einstein condensates, showing significant differences from Mathieu's equation and allowing the description of generalized parametric resonance. The GME can distinguish between the two equations when epsilon is greater than or equal to 1 and delta is approximately 0.25, explaining experimental results, predicting behavior, and easily implemented in experiments for both nematic and spin space models.
Article
Physics, Multidisciplinary
V. K. Kozin, V. A. Shabashov, A. Kavokin, I. A. Shelykh
Summary: This study reveals that even in the absence of external electric fields, electrically neutral excitons can be influenced by crossed electric and magnetic fields, changing the direction of their propagation. The anomalous exciton Hall effect proposed in this research can be used for spatial separation of dark and bright excitons.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
Stella Kutrovskaya, Sevak Demirchyan, Anton Osipov, Stepan Baryshev, Anton Zasedatelev, Pavlos Lagoudakis, Alexey Kavokin
Summary: Linear carbon-based materials such as polyyne and cumulene oligomers offer a versatile platform for nano-physics and engineering, with promising potential for observing strong and unusual excitonic effects. Recent research has shown sharp exciton peaks in low temperature photoluminescence spectra of polyyne chains, with the time-resolved optical response analyzed to predict exciton radiative lifetime dependence on band-gap value and chain length, achieving a good agreement between experiment and theory.
NEW JOURNAL OF PHYSICS
(2021)
Article
Physics, Multidisciplinary
I. Y. Chestnov, S. M. Arakelian, A. Kavokin
Summary: The artificial gauge field for electrically neutral exciton polaritons can be synthesized by applying crossed electric and magnetic fields, leading to the appearance of a linear-in-momentum contribution to the exciton kinetic energy due to the motional (magneto-electric) Stark effect. The strong sensitivity of the exciton energy to momentum in the crossover regime can result in large values of the gauge field, as demonstrated in a specific example of a GaAs ring-shape polariton Berry phase interferometer.
NEW JOURNAL OF PHYSICS
(2021)
Article
Optics
Evgeny Sedov, Irina Sedova, Sergey Arakelian, Alexey Kavokin
Summary: Our technique combines the spin-orbit interaction and confinement of light to generate polygonal optical patterns in real space. The spin-orbit interaction from the splitting of TE and TM optical modes leads to oscillations in space of propagating polarized photons. These photons, confined in a harmonic potential, follow closed trajectories of a polygonal form.
Article
Chemistry, Physical
Carlos Anton-Solanas, Maximilian Waldherr, Martin Klaas, Holger Suchomel, Tristan H. Harder, Hui Cai, Evgeny Sedov, Sebastian Klembt, Alexey V. Kavokin, Sefaattin Tongay, Kenji Watanabe, Takashi Taniguchi, Sven Hofling, Christian Schneider
Summary: The emergence of two-dimensional crystals has sparked research activity in solid-state physics, specifically in the area of enhanced charge carrier correlations. Compelling evidence of bosonic condensation and the observation of spatially extended condensate have been found, furthering the development of coherent light sources and valleytronic devices based on atomically thin crystals.
Correction
Chemistry, Physical
Carlos Anton-Solanas, Maximilian Waldherr, Martin Klaas, Holger Suchomel, Tristan H. Harder, Hui Cai, Evgeny Sedov, Sebastian Klembt, Alexey V. Kavokin, Sefaattin Tongay, Kenji Watanabe, Takashi Taniguchi, Sven Hofling, Christian Schneider
Article
Chemistry, Multidisciplinary
Stella Kutrovskaya, Vlad Samyshkin, Anastasia Lelekova, Alexey Povolotskiy, Anton Osipov, Sergey Arakelian, Alexey Vitalievich Kavokin, Alexey Kucherik
Summary: Macroscale carbon structures with sp-sp(2) hybridization characteristics are formed through self-assembly in colloidal solutions under the influence of laser irradiation and electromagnetic fields. The sponge-like morphology, sculpted with gold nanoparticles, is revealed by SEM imaging. The self-assembled sponges are fully characterized for structure and defects using micro-Raman spectroscopy, showing a strong spectral band in the visible range of photoluminescence spectra that is unusual for ordered sp(2)-carbon systems.
Article
Physics, Multidisciplinary
Junhui Cao, Simone De Liberato, Alexey Kavokin
Summary: The vacuum Rabi splitting in semiconductor microcavities scales with the square root of oscillator strength, but a new polaritonic resonance is formed when the Rabi splitting exceeds the stop-band width of the Bragg mirrors. This phenomenon occurs when the material hosting excitons hybridises with the microcavity modes outside the stop-band, resulting in unique polaritonic features.
NEW JOURNAL OF PHYSICS
(2021)
Article
Multidisciplinary Sciences
Hangyong Shan, Lukas Lackner, Bo Han, Evgeny Sedov, Christoph Rupprecht, Heiko Knopf, Falk Eilenberger, Johannes Beierlein, Nils Kunte, Martin Esmann, Kentaro Yumigeta, Kenji Watanabe, Takashi Taniguchi, Sebastian Klembt, Sven Hoefling, Alexey Kavokin, Sefaattin Tongay, Christian Schneider, Carlos Anton-Solanas
Summary: The study demonstrates a strong light-matter coupling regime between microcavity photons and excitons in an atomically thin WSe2. Coherence buildup is accompanied by a threshold-like behavior in the emitted light intensity, characteristic of a polariton laser effect. Valley physics is also evident in the manipulation of polaritons via the valley-Zeeman effect in the presence of an external magnetic field.
NATURE COMMUNICATIONS
(2021)
Article
Physics, Applied
Evgeny Sedov, Mikhail Glazov, Alexey Kavokin
Summary: In this paper, we propose a method for exciting polariton Tamm states with a controllable nontrivial topology. By applying an external magnetic field on the interface of specific point group photonic crystals, the dispersion of Tamm polaritons can be made asymmetric. The phenomenology of Tamm polariton currents resembles that of a Z(2) topological insulator and the proposed structure can act as an optical spin splitter controlled by the magnetic field magnitude.
PHYSICAL REVIEW APPLIED
(2022)
Article
Materials Science, Multidisciplinary
Sevak Demirchyan, Alexey Kavokin
Summary: This study investigates the disappearance of magnetic field induced edge currents in a Mobius stripe, leading to the formation of a stationary charge density wave. The interplay between the magnetic field dependence of the chemical potential and the screened Coulomb repulsion of charge carriers governs the profile of this wave, providing an experimental tool for studying electron density of states in two-dimensional crystal films.
Article
Physics, Multidisciplinary
S. G. Sharapov, A. A. Varlamov, C. Goupil, A. Kavokin
Summary: The study proposes an ideal reversible thermodynamic cycle visualization of the Nernst effect in Laughlin geometry, expressing the corresponding values of off-diagonal thermoelectric coefficients through the ratio of entropy budget per magnetic flux. The research enlightens the profound thermodynamic origin of the relation between the Nernst effect and magnetization currents.
PHYSICAL REVIEW RESEARCH
(2021)
Article
Physics, Multidisciplinary
Stella Kutrovskaya, Sevak Demirchyan, Anton Osipov, Stepan Baryshev, Anton Zasedatelev, Pavlos Lagoudakis, Alexey Kavokin
Summary: The study observed sharp exciton peaks in the photoluminescence spectra of monoatomic carbon chains stabilized by gold nanoparticles on a glass substrate. Characteristic energies of excitonic transitions in this quasi-one-dimensional nanosystem were estimated using the variational method, showing an interplay between various energies significantly lower than the direct exciton binding energy.
PHYSICAL REVIEW RESEARCH
(2021)
Article
Physics, Multidisciplinary
Yan Xue, Igor Chestnov, Evgeny Sedov, Evgeniy Kiktenko, Aleksey K. Fedorov, Stefan Schumacher, Xuekai Ma, Alexey Kavokin
Summary: Superposition states of circular currents of exciton-polaritons mimic superconducting flux qubits. Phase of a polariton fluid must change by integer multiples of 2 pi around a ring, with the possibility of introducing a pi-phase delay line to control circular currents. This technology has the potential to be a valuable alternative to superconducting qubits, with the ability to perform single-qubit logic operations and design gates for quantum computations.
PHYSICAL REVIEW RESEARCH
(2021)
Article
Physics, Multidisciplinary
E. S. Sedov, V. A. Lukoshkin, V. K. Kalevich, P. G. Savvidis, A. Kavokin
Summary: In this study, we investigate the internal dynamics of exciton-polariton condensates in a cylindrical pillar microcavity with embedded quantum wells created by nonresonant optical pumping. The controllable polariton flows are demonstrated by breaking the rotational symmetry of the system and switching between integer and fractional orbital angular momenta (OAM) states. By adjusting the position and ellipticity of the pump spot, the phase of the condensate is significantly affected, leading to the observation of polariton current states with various topological charges.
PHYSICAL REVIEW RESEARCH
(2021)
