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Anisotropic Superfluidity in a Weakly Interacting Condensate of Quasi-2D Photons
P. 1800431-1–1800431-8.
Voronova N., Yurii E. Lozovik
The anisotropic superfluidity in a weakly interacting two‐dimensional Bose gas of photons in a dye‐filled optical microcavity is investigated, taking into account the dependence of the photon effective mass on the in‐plane coordinate. With the use of the generalized Gross–Pitaevskii equation and the Bogoliubov approach, it is shown that the modulation of the microcavity width leads to an effective periodic potential and the periodicity of the condensate wave function, and both the condensate energy and the spectrum of elementary excitations depend on the direction of motion. The anisotropic character of the dynamical and superfluid properties, such as helicity modulus, superfluid density, and sound velocity, as well as experimentally observable manifestations of their anisotropy are described.
In book
Weinheim: Wiley-VCH, 2019.
Azat F. Aminov, Alexey A. Sokolik, Yurii E. Lozovik, Physical Review A: Atomic, Molecular, and Optical physics 2024 Vol. 110 No. 1 Article 013318
Two-component systems consisting of mutually interacting particles can demonstrate both intracomponent transport effects and intercomponent entrainment (or drag) effects. In the presence of superfluidity, the intracomponent transport is characterized by dissipative conductivity and superfluid weight in the framework of two-fluid model, and intercomponent entrainment gives rise to normal and nondissipative drag effects. We present unified ...
Added: July 22, 2024
Pinchenkova V., Matveenko S., Yudson Vladimir I. et al., Comptes Rendus Physique 2023 Vol. 24 No. S3 P. 101–111
We investigate the effect of weak disorder on the superfluid properties of two-component quasi-two-dimensional dipolar Fermi gases. The dipole-dipole interaction amplitude is momentum dependent, which violates the Anderson theorem claiming that the weak disorder has practically no influence on the superfluid transition temperature in the weakly interacting regime. We find that for dipolar fermions the ...
Added: September 8, 2023
Dmitriev V. V., Kutuzov M. S., Soldatov А. А. et al., JETP Letters 2020 Vol. 112 No. 12 P. 780–785
We present experiments on nematic aerogel oscillating in superfluid 3He. This aerogel consists of nearly parallel mullite strands and is attached to a vibrating wire moving along the direction of the strands. Previous nuclear magnetic resonance experiments in 3He confined in similar aerogel sample have shown that the superfluid transition of 3He in aerogel occurs into the polar ...
Added: October 29, 2022
Суровцев Е. В., Журнал экспериментальной и теоретической физики 2021 Т. 160 № 4 С. 553–564
Potential flow of 3He through a spherical nematic aerogel is considered. A characteristic feature of the system under consideration is that the superfluid phases inside and outside the aerogel may be different. In particular, the cases are considered when the polar phase of superfluid 3He is implemented inside the aerogel, while, outside the aerogel, there ...
Added: October 29, 2022
Martins G., Berman O., Gumbs G. et al., Physical Review B: Condensed Matter and Materials Physics 2022 Vol. 106 No. 10 Article 104304
The quantum entanglement between two excitons in two-dimensional materials, embedded in an optical microcavity, was investigated. The energy eigenstates of a Jaynes-Cummings like Hamiltonian for two qubits coupled to a single cavity mode have been calculated. The quantum entanglement between such states was estimated by calculating the concurrence between two qubits in each of these ...
Added: October 24, 2022
Dmitriev V. V., Kutuzov M. S., Soldatov A. A. et al., Physical Review Letters 2021 Vol. 127 No. 26 Article 265301
It is known that in low magnetic fields the superfluid transition of 3He in nematic aerogel occurs into the polar phase. Using a vibrating aerogel resonator, we observe that in high magnetic fields this transition splits into two discrete transitions, occurring at different temperatures. According to theoretical models, a new superfluid phase— the β phase— should be realized between ...
Added: October 17, 2022
Azat F. Aminov, Alexey A. Sokolik, Yurii E. Lozovik, QUANTUM 2022 Vol. 6 Article 787
The Andreev-Bashkin effect, or superfluid drag, is predicted in a system of Bose-condensed excitonic polaritons in optical microcavity coupled by electron-exciton interaction with a superconducting layer. Two possible setups with spatially indirect dipole excitons or direct excitons are considered. The drag density characterizing a magnitude of this effect is found by many-body calculations with taking ...
Added: August 25, 2022
Левин Г. Г., Minaev V., Minkov K. N. et al., Оптика и спектроскопия 2019 Т. 126 № 3 С. 305–310
A microscope for studying internal inhomogeneities of the refractive index of optical dielectric
microcavities by optical tomography is developed. The influence of these inhomogeneities on the Q factor of
optical dielectric microcavities formed by thermal treatment is experimentally studied. ...
Added: November 2, 2021
Pozina G., Hemmingsson C., Levitskii I. et al., Physica Status Solidi (A) Applications and Materials 2020 Vol. 217 No. 14 Article 1900894
Fabrication of microcavities based on III-nitrides is challenging due to difficulties with the coherent growth of heterostructures having a large number of periods, at the same time keeping a good precision in terms of thickness and composition of the alloy. A planar design for GaN microresonators supporting whispering gallery modes is suggested. GaN hexagonal microstructures ...
Added: October 9, 2021
Scherbak S., Kryzhanovskaya N., Zhukov A., , in: 7th International School and Conference "Saint-Petersburg OPEN 2020" on Optoelectronics, Photonics, Engineering and NanostructuresVol. 1695: 7th International School and Conference "Saint Petersburg OPEN 2020": Optoelectronics, Photonics, Engineering and Nanostructures April 27-30, 2020, Saint Petersburg, Russian Federation.: Bristol: Institute of Physics Publishing (IOP), 2020. P. 012128-1–012128-6.
We performed a numerical study of a surrounding medium influence on coupling
efficiency between a microdisk resonator supporting optical whispering gallery modes and a
straight optical waveguide. Quality factors of the modes and relative optical power coupled to
the waveguide were calculated using COMSOL Multiphysics environment. It was shown that
the most efficient coupling takes place when propagation constants ...
Added: January 27, 2021
Matveenko S. I., Yudson V.I., Altshuler B. L. et al., Physical Review A: Atomic, Molecular, and Optical physics 2020 Vol. 102 No. 5 P. 053319 (1)–053319 (8)
We consider a weakly interacting two-component Fermi gas of dipolar particles (magnetic atoms or polar molecules) in two-dimensional geometry. The dipole-dipole interaction (together with the short-range interaction at Feshbach resonances) for dipoles perpendicular to the plane of translational motion may provide a superfluid transition. The dipole-dipole scattering amplitude is momentum dependent, which violates the Anderson ...
Added: January 15, 2021
Гусаков М. Е., Кантор Е. М., Ofengeim D., Monthly Notices of the Royal Astronomical Society 2020 Vol. 499 No. 3 P. 4561–4569
The self-consistent approach to the magnetic field evolution in neutron star (NS) cores, developed recently, is generalized to the case of superfluid and superconducting NSs. Applying this approach to the cold matter of NS cores composed of neutrons, protons, electrons, and muons, we find that, similarly to the case of normal matter, an arbitrary configuration ...
Added: November 11, 2020
Бабичев А. В., Кадинская С. А., Шубина К. Ю. et al., Физика и техника полупроводников 2020 Т. 54 № 9 С. 833–840
The results of experiments aimed at fabricating and studying the properties of photodetector structures based on single-layer graphene produced by chemical vapor deposition are presented. The configuration of a Ta2O5 vertical microcavity with a resonance wavelength of about 850 nm and a lower dielectric SiO2/Ta2O5 distributed Bragg reflector is taken as the base structure. The ...
Added: November 9, 2020
Zhukov A. E., Optics Express 2018 Vol. 26 No. 19 P. 25280–25292
We show theoretically and experimentally that distributed Bragg reflector (DBR)
supports a surface electromagnetic wave exhibiting evanescent decay in the air and oscillatory
decay in the DBR. The wave exists in TM polarization only. The field extension in the air
may reach several wavelengths of light. Once gain medium is introduced into the DBR a
novel class of diode ...
Added: February 10, 2020
Demenev A. A., Yaremkevich D. D., Scherbakov A. V. et al., Physical Review B: Condensed Matter and Materials Physics 2019 Vol. 100 No. 10 P. 100301
In the reported experiment, a picosecond strain pulse induces a sharp transition between the steady states in a
bistable cavity-polariton system. The strain pulse of 10-ps duration, generated in the GaAs substrate and injected
into a high-Q GaAs/AlAs microcavity, modulates the exciton resonance energies of the embedded quantum wells
and correspondingly of the polariton resonances. When the microcavity ...
Added: November 20, 2019
Stochastic and deterministic switches in a bistable polariton micropillar under short optical pulses
Uvarov A. V., Gavrilov S S, Kulakovskii V D et al., Physical Review A: Atomic, Molecular, and Optical physics 2019 Vol. 99 No. 3 P. 033837
Optical bistability of exciton polaritons in semiconductor microcavities is a promising platform for digital optical devices. Steady states of coherently driven polaritons can be toggled back and forth in tens of picoseconds under short external pulses of appropriate amplitude and phase. We have analyzed the switching behavior depending on the pulse amplitude, phase, and duration. ...
Added: November 20, 2019