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## Anisotropic superfluidity of two-dimensional excitons in a periodic potential

Physical Review B: Condensed Matter and Materials Physics. 2017. Vol. 95. No. 24-5430. P. 245430-1-245430-19.

We study anisotropies of the helicity modulus, excitation spectrum, sound velocity, and angle-resolved luminescence spectrum in a two-dimensional system of interacting excitons in a periodic potential. Analytical expressions for anisotropic corrections to the quantities characterizing superfluidity are obtained. We consider particularly the case of dipolar excitons in quantum wells. For GaAs/AlGaAs heterostructures as well as MoS2/hBN/MoS2 and MoSe2/hBN/WSe2 transition-metal dichalcogenide bilayers estimates of the magnitude of the predicted effects are given. We also present a method to control superfluid motion and to determine the helicity modulus in generic dipolar systems.

Ю.Е. Лозовик, Успехи физических наук 2018 Т. 188 № 11 С. 1203-1208

Рассматриваются новые эффекты в системах квантовых диполей: анизотропная сверхтекучесть во внешних полях, эффекты сильных корреляций и кристаллизация, фаза суперсолида. Анализируются эффекты ротонной неустойчивости, типичные для сильно коррелированных бозе-систем, но проявляющиеся в слабо взаимодействующей системе наклонных диполей. Интересными физическими реализациями рассматриваемых систем являются дипольные экситоны в связанных квантовых ямах либо в одиночной квантовой яме в сильном ...

Added: October 22, 2018

Oleg L. Berman, Roman Ya. Kezerashvili, Yurii E. Lozovik et al., Physical Review B: Condensed Matter and Materials Physics 2019 Vol. 100 No. 13 P. 134514-1-134514-8

We propose controlling an electron-hole superfluid in semiconductor coupled quantum wells and double layers of a two-dimensional (2D) material by an external periodic field. This can be created either by the gates periodically located and attached to the quantum wells or double layers of the 2D material or by the moiré pattern of two twisted ...

Added: October 22, 2019

N. A. Asriyan, I. L. Kurbakov, A. K. Fedorov et al., Physical Review B: Condensed Matter and Materials Physics 2019 Vol. 99 No. 08-5108 P. 085108-1-085108-8

We consider a bilayer system of two-dimensional Bose-Einstein-condensed dipolar dark excitons (upper layer) and bright ones (bottom layer). We demonstrate that the interlayer interaction leads to a mixing between excitations from different layers. This mixing leads to the appearance of a second spectral branch in the spectrum of bright condensate. The excitation spectrum of the ...

Added: March 8, 2019

A. K. Fedorov, I. L. Kurbakov, Yu. E. Lozovik, Physical Review B: Condensed Matter and Materials Physics 2014 Vol. 90 No. 16 P. 165430

The formation of the roton-maxon excitation spectrum and the roton instability effect for a weakly correlated Bose gas of dipolar excitons in a semiconductor layer are predicted. The stability diagram is calculated. According to our numerical estimations, the threshold of the roton instability for Bose-Einstein condensed exciton gas with roton-maxon spectrum is achievable experimentally, e.g., ...

Added: December 24, 2014

A. K. Fedorov, I. L. Kurbakov, Y. E. Shchadilova et al., Physical Review A: Atomic, Molecular, and Optical physics 2014 Vol. 90 No. 4 P. 043616

We predict the effect of the roton instability for a two-dimensional weakly interacting gas of tilted dipoles in a single homogeneous quantum layer. Being typical for strongly correlated systems, the roton phenomena appear to occur in a weakly interacting gas. It is important that in contrast to a system of normal to the layer dipoles, ...

Added: December 24, 2014

Oleg. L. Berman, Roman Ya. Kezerashvili, Yurii E. Lozovik, Journal of the Optical Society of America B: Optical Physics 2017 Vol. 34 P. 1649-1658

The condensate density profile of trapped two-dimensional gas of photons in an optical microcavity, filled by a dye solution, is analyzed taking into account a coordinate-dependent effective mass of cavity photons and photon–photon coupling parameter. The profiles for the densities of the superfluid and normal phases of trapped photons in the different regions of the ...

Added: November 28, 2017

Михаил Евгеньевич Гусаков, Елена Михайловна Кантор, 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

Маслов Виктор Павлович, Доклады Российской академии наук. Математика, информатика, процессы управления (ранее - Доклады Академии Наук. Математика) 2015 Т. 462 № 1 С. 30-34

A new distribution corresponding to thermodynamics in supercritical and subcritical regions and in the region of negative pressure is considered. ...

Added: September 8, 2015

Kagan M.Yu., Springer, 2013

Overview This book concisely presents the latest trends in the physics of superconductivity and superfluidity and magnetismin novel systems, as well as the problem of BCS-BEC crossover in ultracold quantum gases and high-Tc superconductors. It further illuminates the intensive exchange of ideas between these closely related fields of condensed matter physics over the last 30 ...

Added: February 17, 2014

Максимов М. В., Zhukov A., Письма в Журнал технической физики 2019 Т. 45 № 11 С. 20-23

InGaAs/InGaAlAs laser diodes operating in the 1.55-μm spectral range are studied. It is demonstrated
that a certain level of carbon doping (1012 cm–2 per a single quantum well) allows one to reduce the
temperature coefficient of variation of the lasing wavelength in such structures and raise the characteristic
temperature of threshold current and differential efficiency at temperatures from ...

Added: March 16, 2021

G. V. Budkin, Makhov I. S., D. A. Firsov, Journal of Physics: Condensed Matter 2021 Vol. 33 No. 16 Article 165301

The flow of electric current in quantum well breaks the space inversion symmetry, which leads to the dependence of the radiation transmission on the relative orientation of current and photon wave vector, this phenomenon can be named current drag of photons. We have developed a microscopic theory of such an effect for intersubband transitions in ...

Added: October 8, 2021

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

Окубо Ю. undefined., Journal of Physics: Conference Series 2017 Vol. 804 No. 012036 P. 1-8

We investigate the existence and the orthogonality of the generalized Jack symmetric functions which play an important role in the AGT relations. We show their orthogonality by deforming them to the generalized Macdonald symmetric functions. ...

Added: October 26, 2017

Andrew G. Semenov, Andrei D. Zaikin, Physical Review B: Condensed Matter and Materials Physics 2013 Vol. 88 No. 5 P. 054505-1-054505-10

We investigate the effect of interacting quantum phase slips on persistent current and its fluctuations in ultrathin superconducting nanowires and nanorings pierced by the external magnetic flux. We derive the effective action for these systems and map the original problem onto an effective sine-Gordon theory on torus. We evaluate both the flux dependent persistent current ...

Added: February 9, 2015

Slunyaev A., Анна Витальевна Кокорина, Water Waves, Springer 2019 P. 1-20

The issue of accounting of the wave breaking phenomenon in direct numerical simulations of oceanic waves is discussed. It is emphasized that this problem is crucial for the deterministic description of waves, and also for the dynamical calculation of extreme wave statistical characteristics, such as rogue wave height probability, asymmetry, etc. The conditions for accurate ...

Added: October 13, 2019

Marshakov A., Андрей Дмитриевич Миронов, Алексей Юрьевич Морозов, Journal of Geometry and Physics 2011 Vol. 61 P. 1203-1222

We present a summary of current knowledge about the AGT relations for conformal blocks with additional insertion of the simplest degenerate operator, and a special choice of the corresponding intermediate dimension, when the conformal blocks satisfy hypergeometric-type differential equations in position of the degenerate operator. A special attention is devoted to representation of conformal block ...

Added: February 28, 2013

Prazdnichnykh A., Glazov M., L. Ren et al., Physical Review B: Condensed Matter and Materials Physics 2021 Vol. 103 No. 8 P. 085302-1-085302-12

The exciton valley dynamics in van der Waals heterostructures with transition metal dichalcogenide monolayers is driven by the long-range exchange interaction between the electron and the hole in the exciton. It couples the states active in the opposite circular polarizations resulting in the longitudinal-transverse splitting of excitons propagating in the monolayer plane. Here we study ...

Added: March 5, 2021

Pelinovsky E., I. Didenkulova, A. Rybkin, Journal of Fluid Mechanics 2014 Vol. 748 P. 416-432

We present an exact analytical solution of the nonlinear shallow water theory for wave run-up in inclined channels of arbitrary cross-section, which generalizes previous studies on wave run-up for a plane beach and channels of parabolic cross-section. The solution is found using a hodograph-type transform, which extends the well-known Carrier–Greenspan transform for wave run-up on ...

Added: November 19, 2014

Pelinovsky E., Kurkin A. A., A Kozelkov et al., European Journal of Mechanics - B/Fluids 2018 Vol. 72 P. 616-623

The paper presents results of numerical simulations of freely rising solid spheres in a viscous fluid. The
diameter of spheres was 5 mm, 7 mm, 10 mm, and 20 mm, and the corresponding Reynolds numbers
varies in the interval 1400 < Re < 10100. It has been found that the free rise path varies, as the
Galileo number ...

Added: October 21, 2018

Bodrova A., Alexander Osinsky, Nikolai V. Brilliantov, Scientific Reports 2020 Vol. 10 Article 693

We study analytically and numerically the distribution of granular temperatures in granular mixtures for
different dissipation mechanisms of inelastic inter-particle collisions. Both driven and force-free systems
are analyzed. We demonstrate that the simplified model of a constant restitution coefficient fails to
predict even qualitatively a granular temperature distribution in a homogeneous cooling state. At the
same time we reveal ...

Added: February 25, 2020

Budkov Y., A.L. Kolesnikov, Polymer Science - Series C 2018 Vol. 60 No. Supplement 1 P. 148-159

Theoretical models of the conformational behavior of flexible polymer chains in mixed solvents enunciated in the world literature during the last decade are critically reviewed. Models describing different mechanisms of coil-to-globule transitions in a good solvent induced by cosolvent addition are highlighted. Special attention is given to the analysis of theoretical approaches to describing the ...

Added: November 30, 2018

М.: ИКИ РАН, 2011

Added: March 26, 2013

Min Namkung, Kwon Younghun, Scientific Reports 2018 Vol. 8 No. 1 P. 16915-1-16915-18

Sequential state discrimination is a strategy for quantum state discrimination of a sender’s quantum
states when N receivers are separately located. In this report, we propose optical designs that can
perform sequential state discrimination of two coherent states. For this purpose, we consider not
only binary phase-shifting-key (BPSK) signals but also general coherent states, with arbitrary prior
probabilities. Since ...

Added: November 16, 2020

Akhmedov E., E.T. Musaev, Physical Review D - Particles, Fields, Gravitation and Cosmology 2010 Vol. 81 P. 085010

We show that Polchinski equations in the D-dimensional matrix scalar field theory can be reduced at large N to the Hamiltonian equations in a (D+1)-dimensional theory. In the subsector of the Trϕl (for all l) operators we find the exact form of the corresponding Hamiltonian. The relation to the holographic renormalization group is discussed. ...

Added: February 27, 2013