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## О координатно-зависимой эффективной массе в бозе-конденсатах фотонов и поляритонов в ловушке оптической микрополости

Письма в Журнал экспериментальной и теоретической физики. 2018. Т. 108. № 12. С. 805-809.

Воронова Н. С., Ю. Е. Лозовик

Keywords: Bose condensationбозе-конденсацияexcitonic polaritonsэкситонные поляритоныoptical microcavitiesоптическая микрополость

Publication based on the results of:

Voronova N. S., Kurbakov I. L., 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

Voronova N. S., Elistratov A. A., 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

Воронова Н. С., Посаженков М. А., Ю. Е. Лозовик, Письма в Журнал экспериментальной и теоретической физики 2017 Т. 106 № 11 С. 718-723

В работе представлено теоретическое описание вихревых решений связанных уравнений типа Гросса-Питаевского в двухкомпонентном бозе-конденсате экситонных поляритонов с учетом зависимости энергии расщепления Раби от плотности экситонной составляющей. Показано, что учет эффекта голубого сдвига приводит к значительному снижению плотностей обеих компонент конденсата. Вычислены пространственные профили экситонов и фотонов в поляритонной системе с учетом нелинейных поправок и энергия ...

Added: November 28, 2017

Plyashechnik A., Alexey A. Sokolik, Voronova N. et al., Physical Review B: Condensed Matter and Materials Physics 2023 Vol. 108 No. 2 Article 024513

Bose-Fermi systems such as mixtures of electrons with excitons or exciton-polaritons are extensively discussed as candidates to host a variety of intriguing phenomena, including polaron formation, drag effects, supersolidity, and superconductivity. In this paper, assuming the strong-coupling regime between the semiconductor excitons and cavity photons, we develop the many-body theory approach addressing the interplay of ...

Added: August 22, 2023

Shishkov V. Y., Andrianov E. S., 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

Grudinina A. M., Kurbakov I. L., 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

Shishkov V., Andrianov E., Zasedatelev A. 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

Zasedatelev A., Baranikov A., Sannikov D. 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

Voronova N., Elistratov A., 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

Maximov T., Kurbakov I., Voronova N. et al., Physical Review B: Condensed Matter and Materials Physics 2024 Vol. 108 No. 19 Article 195304

We develop the many-body theory of dipolar exciton-polaritons in an optical microcavity in crossed out-of-plane electric and in-plane magnetic fields. Even for relatively weak fields, we reveal the existence of two minima in the bare lower-polariton dispersion, which give rise to the tunable transition between the polariton Bose-Einstein condensate and that of excitons, produced by ...

Added: August 22, 2023

Fedorov A. K., Kurbakov I. L., Shchadilova Y. E. 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

Asriyan N. A., Kurbakov I. L., Fedorov A. K. 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

Berman O. L., Kezerashvili R., 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

Fedorov A. K., Kurbakov I. L., 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

Kulakovskii V D, Demenev A. A., 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

Asriyan N. A., Elistratov A. A., Yu. E. Lozovik, QUANTUM 2023 Vol. 7 Article 1144

Bose-condensation in a system of 2D quasiparticles is considered in the scope of a microscopic model. Mean-field dynamical equations are derived with the help of the Schwinger-Keldysh formalism and a simple model is proposed which allows to describe key features of condensate formation in systems with various quasiparticle decay rates. By analysing stationary solutions of ...

Added: April 16, 2024

Berman O. L., Kezerashvili R., 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

Makarov D. V., Elistratov A. A., 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

Voronova N., 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., Гиппиус Н. А., 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

Voronova N., Kurbakov I., Yurii E. Lozovik, , in : Proceedings of SPIE, Volume 10912, Physics and Simulation of Optoelectronic Devices XXVII. : Bellingham : SPIE, 2019. P. 1091205-1-1091205-17.

The possibility to observe a macroscopically coherent state in a gas of two-dimensional direct excitons at temperatures up to tens of Kelvin is described. The dramatic increase of the exciton lifetime allowing effective thermalization is predicted for the o -resonant cavities that strongly suppress exciton recombination. The material
systems considered are single GaAs quantum wells of ...

Added: November 1, 2019

Kagan M.Yu., Turlapov A. V., 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

Kulakovskii V D, Demenev A. A., Brichkin A. S. 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

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