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## Внутренняя структура вихрей в двухкомпонентном конденсате экситонных поляритонов

JETP Letters. 2017. Т. 106. № 11. С. 718-723.

Keywords: Bose condensationбозе-конденсацияexcitonic polaritonsэкситонные поляритоныquantized vorticesквантованные вихри

Publication based on the results of:

N.S. Voronova, A.A. Elistratov, Lozovik Y., Physical Review B: Condensed Matter and Materials Physics 2016 Vol. 94 No. July P. 045413

Exciton-photon beats known as polariton Rabi oscillations in semiconductor microcavities are usually excited by short pulses of light. We consider a different pumping scheme, assuming a cw pumping of the Rabi oscillator from an exciton reservoir. We account for the initial pulse of light setting the phase, exciton decay due to exciton-phonon and exciton-exciton scattering, ...

Added: September 14, 2016

Н. С. Воронова, Ю. Е. Лозовик, Письма в Журнал экспериментальной и теоретической физики 2018 Т. 108 № 12 С. 805-809

Исследуется влияние переменной (координатно-зависимой) эффективной массы частиц на поведение квази-двумерных конденсатов фотонов и экситонных поляритонов в параболической ловушке полупроводниковой оптической микрополости. Показано, что правильный учет зависимости эффективной массы от координаты в операторе кинетической энергии приводит к изменению эффективного потенциала конфайнмента частиц. Для фотонной системы найдены поправки к энергии и волновой функции бозе-конденсата. Для экситонных поляритонов ...

Added: November 2, 2018

N. S. Voronova, I. L. Kurbakov, Lozovik Y., Physical Review Letters 2018 Vol. 121 No. 23-5702 P. 235702-1-235702-6

We propose a way to increase the lifetime of two-dimensional direct excitons and show the possibility to observe their macroscopically coherent state at temperatures much higher than that of indirect exciton condensation. For a single GaAs quantum well embedded in photonic layered heterostructures with subwavelength period, we predict the exciton radiative decay to be strongly ...

Added: December 5, 2018

A. M. Grudinina, I. L. Kurbakov, Yu. E. Lozovik et al., Physical Review B: Condensed Matter and Materials Physics 2021 Vol. 104 No. 12 P. 125301-1-125301-13

Microcavity exciton-polaritons, known to exhibit nonequilibrium Bose condensation at high critical temperatures, can also be brought in thermal equilibrium with the surrounding medium and form a quantum degenerate Bose-Einstein distribution. It happens when their thermalization time in the regime of positive detunings – or, alternatively, for high-finesse microcavities – becomes shorter than their lifetime. Here ...

Added: September 27, 2021

V. Yu. Shishkov, E. S. Andrianov, Lozovik Y., QUANTUM 2022 Vol. 6 Article 719

The theoretical description of non-equilibrium Bose–Einstein condensate (BEC) is one of the main challenges in modern statistical physics and kinetics. The non-equilibrium nature of BEC makes it impossible to employ the well-established formalism of statistical mechanics. We develop a framework for the analytical description of a non-equilibrium phase transition to BEC that, in contrast to ...

Added: August 25, 2022

Anton V. Zasedatelev, Anton V. Baranikov, Denis Sannikov et al., Nature 2021 Vol. 597 P. 493-498

The recent progress in nanotechnology1,2 and single-molecule spectroscopy3–5 paves the way for emergent cost-effective organic quantum optical technologies with potential applications in useful devices operating at ambient conditions. We harness a π-conjugated ladder-type polymer strongly coupled to a microcavity forming hybrid light–matter states, so-called exciton-polaritons, to create exciton-polariton condensates with quantum fluid properties. Obeying Bose ...

Added: September 27, 2021

Nina Voronova, Andrei Elistratov, Yurii Lozovik, Physical Review Letters 2015 Vol. 115 No. 18 P. 186402

We theoretically analyze exciton-photon oscillatory dynamics within a homogenous polariton condensate in presence of energy detuning between the cavity and quantum well modes. Whereas pure Rabi oscillations consist of the particle exchange between the photon and exciton components in the polariton system without any oscillations of their quantum phases, we demonstrate that any non-zero detuning ...

Added: October 22, 2015

Vladislav Yu. Shishkov, Evgeny S. Andrianov, Anton V. Zasedatelev et al., Physical Review Letters 2022 Vol. 128 No. 12 Article 065301

In this Letter, we give an analytical quantum description of a nonequilibrium polariton Bose-Einstein condensate (BEC) based on the solution of the master equation for the full polariton density matrix in the limit of fast thermalization. We find the density matrix of a nonequilibrium BEC, that takes into account quantum correlations between all polariton states. ...

Added: May 9, 2022

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

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

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, 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

S. S. Gavrilov, Physical Review B: Condensed Matter and Materials Physics 2020 Vol. 102 Article 104307

It is generally accepted that quantized vortices formed in coherent bosonic fluids are “excitations” and as such do not arise in a one-mode condensate at zero temperature. To excite them, one needs either inhomogeneities (impurities, rotation, etc.) or essentially finite fluctuations. Here, we predict a perfectly spontaneous formation of vortices even at zero temperature, which ...

Added: March 11, 2021

Oleg. L. Berman, Roman Ya. Kezerashvili, Yurii E. Lozovik, Physical Review B: Condensed Matter and Materials Physics 2019 Vol. 99 No. 08-5438 P. 085438-1-085438-11

The spin Hall effect for polaritons (SHEP) in a transition metal dichalcogenides (TMDC) monolayer embedded in a microcavity is predicted. We demonstrate that two counterpropagating laser beams incident on a TMDC monolayer can deflect a superfluid polariton flow due to the generation the effective gauge vector and scalar potentials. The components of polariton conductivity tensor ...

Added: March 8, 2019

D.V. Makarov, A.A. Elistratov, Yu.E.Lozovik, Physics Letters A 2020 Vol. 384 No. 36 P. 126942-1-126942-6

Formation of exciton-polariton condensate due to incoherent pumping of an excitonic reservoir is considered. The condensate dynamics is governed by a system of stochastic integro-differential equations of Langevin's type corresponding to the model developed by Elistratov and Lozovik [12]. Attention is concentrated on non-Markovian interaction of the condensate with the excitonic and photonic reservoirs. It ...

Added: October 30, 2020

A Seedhouse, J Wilkes, Kulakovskii V D et al., Optics Letters 2019 Vol. 44 No. 17 P. 4339-4342

We propose the use of dipolaritons-quantum well excitons with a large dipole moment, coupled to a planar microcavity-for generating terahertz (THz) radiation. This is achieved by exciting the system with two THz detuned lasers that leads to dipole moment oscillations of the exciton polariton at the detuning frequency, thus generating a THz emission. We have ...

Added: November 19, 2019

Nina S. Voronova, Yurii E. Lozovik, Micro and Nanostructures 2015

We discuss coherent oscillations between two coupled quantum states of a Bose–Einstein condensate in two-dimensional space at zero temperature. In the system we consider, weak interparticle repulsive interactions occur between the particles in state one only, while the state two particles remain non-interacting. Our theoretical analysis of the coupled generalized Gross–Pitaevskii equations reveals various regimes ...

Added: October 22, 2015

Kulakovskii V., Gavrilov S., Николай Алексеевич Гиппиус, Письма в Журнал экспериментальной и теоретической физики 2017 Т. 106 № 10 С. 655-660

Исследована возможность динамического сжатия поляритонной системы в планарном микрорезо-наторе после окончания резонансного импульса накачки с формированием основного состояния кон-денсата на дне поляритонной зоны. Исследования динамики резонансно возбуждаемого поляритонногогаза в приближении среднего поля показали, что такое состояние конденсата может формироватьсячисто динамически при возбуждении когерентными сходящимися гауссовыми импульсами света с боль-шой апертурой при условии, что активная область ...

Added: April 4, 2018

Kulakovskii V D, A.A. Demenev, A S Brichkin et al., Physical Review B: Condensed Matter and Materials Physics 2018 Vol. 98 No. 20 P. 205424-1-205424-6

The dynamics of a pure low polariton (LP) system created by resonant broadband excitation in a wide range of wave vectors was investigated in a high-Q GaAs-based microcavity. The LP system is shown to inherit the high spatial coherence from the laser pulse and does not lose it during decay. As a result, its dynamics ...

Added: January 9, 2019

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

A.A. Demenev, D D Yaremkevich, A V Scherbakov 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

Kagan M.Yu., A. V. Turlapov, J. Phys.: Condens. Matter 2017 Vol. 29 No. 383004 P. 1-22

Physics of many-body systems where particles are restricted to move in two spatial dimensions is challenging and even controversial: On one hand, neither long-range order nor Bose condensation may appear in innite uniform 2D systems at nite temperature, on the other hand this does not prohibit super uidity or superconductivity. Moreover, 2D superconductors, such
as cuprates, ...

Added: June 23, 2017

A V Larionov, A S Brichkin, S. Höfling et al., Semiconductors 2018 Vol. 52 No. 4 P. 458-461

The transition from the delocalized to the localized state has been investigated in a quasi-onedimensional exciton-polariton system excited nonresonantly in GaAs-based microcavity wire with disordered potential. The photoexcited polariton condensate has been found to spread along the wire with D degrees velocity exceeding 1 mu m/ps. The propagation along the wire is provided by high ...

Added: January 9, 2019

Kulakovskii V D, A A Demenev, Semiconductors 2019 Vol. 53 No. 10 P. 1308-1313

It is found that exciton-polariton systems resonantly excited in GaAs semiconductor microcavities by coherent picosecond laser pulses inherit the high coherence of the laser beam and retain it for their lifetime (>100 ps), while the coherence-formation time in polariton systems resonantly excited by incoherent pulses without excitation of the exciton reservoir exceeds 200 ps. ...

Added: November 19, 2019