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Formation of exciton-polaritonic BEC in the non-Markovian regime
Physics Letters A. 2022. Vol. 453. Article 128492.
Alliluev A., Makarov D., Asriyan N., Elistratov A., Yurii E. Lozovik
Dynamics of exciton-polaritonic Bose-Einstein condensate is considered. We construct the stochastic Gross-Pitaevskii equation, where condensate is coupled to the excitonic reservoir in the non-Markovian regime. This equation is utilized for study of condensate formation. It is found that increasing of temperature results in transition from spatially uniform to fragmented pattern with onset of numerous vortices. The transition temperature corresponds to minimum of condensate density. Below the transition temperature, density decreases with increasing of temperature due to noise-induced loss of phase coherence. Increasing of density above the transition temperature is caused by suppression of memory that facilitates nearly-exponential density growth consistent with the Markovian regime.
Dmitriev A., Kornilov V., Batienkov R., Lecture Notes in Civil Engineering 2026 Vol. 886 P. 249–255
Numerous studies have provided compelling evidence that the probability distribution of avalanche sizes follows a power law, and that 1/f noise is present in the stochastic dynamics of landslides. We present a theoretical explanation of these phenomena within the framework of self-organized criticality theory, proposing a discrete-time model in the form of a sandpile cellular ...
Added: October 13, 2026
Dmitriev A., Shulman I., Lebedev A., Studies in Computational Intelligence 2026 Vol. 1265 P. 266–273
A discrete-time model is presented for the self-organization of the X/Twitter social network to the edge of a phase transition, characterized by avalanche-like propagation of information in the network. The model is based on the analogy between the critical dynamics of the X social network and sandpile cellular automata with Manna rule on the Chung-Lu ...
Added: October 13, 2026
Arutyunov K., Kharitonov I. A., Petrosyants K. O., JETP Letters 2026 Vol. 124 No. 6 P. 1–16
Superconducting properties of metallic micro- and nanowires can be entirely different from those of bulk superconductors. Of particular interest is the nonequilibrium current-induced state of a quasi-one-dimensional superconducting channel. The most interesting phenomenon here is the stepped I–V characteristic, explained by a process known as phase slip center activation. If the origin of such step-like ...
Added: October 13, 2026
Makarov D. M., Kalikin N., Fashchevsky K. A. et al., Electrochimica Acta 2026 Vol. 579 Article 150159
Machine learning (ML) has become a powerful tool for accelerating the development of carbon-based supercapacitors;
however, most published models assume that a single predictive framework can describe both conventional
porous carbons and hybrid carbon electrodes. Here, we test this assumption using a comprehensive
benchmark dataset and an extended literature-curated dataset enriched with synthesis- and electrolyte-related
descriptors. Three ML algorithms ...
Added: October 13, 2026
Махлуф М., Ozhegov R., Elezov M. et al., Фотоника 2026 Vol. 20 No. 6 P. 414–423
This paper compares the ranging precision of direct time-of-flight (dToF) and non-line-of-sight (NLOS) LiDAR architectures, both using a superconducting nanowire single-photon detector (SNSPD). Both systems operate at 1550 nm with a 50 ps pulsed laser and time-correlated single-photon counting (TCSPC). The dToF configuration achieved approximately 100 µm precision at 10 m, while the NLOS configuration achieved 500 µm precision for ...
Added: October 12, 2026
Singapore: Springer, 2026.
This volume presents the Proceedings of the 34th IUPAP Conference on Computational Physics (CCP2023), held in Kobe, Japan on August 4–8, 2023. It offers a collection of peer-reviewed articles that highlight recent developments in computational and simulation research across various areas of physics. Key topics include the use of data science, quantum computing, and machine ...
Added: October 12, 2026
Goncharov A., Chibisov A., Advanced Theory and Simulations 2023 Vol. 12 No. 13 Article 2200816
Designing stable quantum computers with the ability to correct errors responsibly requires a detailed understanding of the physical processes that underlie these devices. In this study, detailed quantum mechanical simulations of the atomic structure, charge distribution of electron density, and distribution and orientation of magnetic and quantum states as a function of applied external pressure ...
Added: October 11, 2026
Chibisov A., Gnidenko A., Chibisova M. et al., FlatChem 2023 Vol. 41 Article 100533
Manufacturing precise quantum computers with small errors in quantum operations, long coherence times, and low power consumption is the most important challenge in modern nanoelectronics. To understand the operating modes of such calculators in detail, both the optimal arrangement of the qubit system within the structure and changes in its magnetic properties must be comprehensively ...
Added: October 11, 2026
M. Yu. Kagan, A. V. Krasavin, R. Sh. Ikhsanov et al., Journal of Superconductivity and Novel Magnetism 2025 Vol. 38 Article 246
In the Review we discuss anomalous aspects of superconductivity (SC) and normal state, as well as formation of inhomogeneous (droplet-like or cluster-like) states in electron systems with attraction. We consider both the models with the retardation (Eliashberg mechanism of SC for strong electron-phonon interaction in metallic hydrogen) and without retardation (but with local onsite attraction). ...
Added: November 25, 2025
A. A. Lyublinskaya, Nosov P. A., Burmistrov I. S., Physical Review B: Condensed Matter and Materials Physics 2025 Vol. 111 No. 9 Article 094302
Correlated quantum many-body states can be created and controlled by the dissipative protocols. Among these, particle number-conserving protocols are particularly appealing due to their ability to stabilize topologically nontrivial phases. Is there any fundamental limitation to their performance? We address this question by examining a general class of models involving a two-band fermion system subjected ...
Added: March 12, 2025
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
Demenev A. A., Tereshko S. N., Gippius N. A. et al., Physical Review B: Condensed Matter and Materials Physics 2024 Vol. 109 No. 8 Article 085423
The temporal behavior of the lower polariton (LP) distribution in the reciprocal space, nLP(k), and formation of
long-range spatial coherence are investigated in a nonequilibrium incoherent LP fluid generated resonantly with
picosecond optical pulses at 2 K in a high-Q planar GaAs/AlAs microcavity with 12 InGaAs quantum wells. The
dynamics of nLP(k) is found to be independent of ...
Added: March 29, 2024
Zhumagulov Y., Chiavazzo S., Shelykh I. et al., Physical Review B: Condensed Matter and Materials Physics 2023 Vol. 108 No. 16 Article L161402
We show that the regime of strong light-matter coupling with remarkable magnetic properties can be imple- mented in systems based on monolayers of chromium triiodide (CrI3). This two-dimensional material combines the presence of strongly bound excitonic complexes with ferromagnetic ordering below the Curie temperature. Using microscopic first-principles calculations, we reveal a rich spectrum of optical ...
Added: November 2, 2023
Sergeev T., Zyablovsky A., Andrianov E. et al., QUANTUM 2023 Vol. 7 Article 982
Exceptional point (EP) is a spectral singularity in non-Hermitian systems. The passing over the EP leads to a phase transition, which endows the system with unconventional features that find a wide range of applications. However, the need of using the dissipation and amplification limits the possible applications of systems with the EP. In this work, ...
Added: August 22, 2023
Sergeev T. T., Zyablovsky A. A., Andrianov E. S. et al., Journal of the Optical Society of America B: Optical Physics 2023 Vol. 40 No. 11 P. 2743–2750
An ultra-strong coupling regime takes place in a compound system when a coupling strength between the subsystems exceeds one tenth of the system eigenfrequency. It transforms into a deep-strong coupling regime when the coupling strength exceeds the system eigenfrequency. In these regimes, there are difficulties with description of relaxation processes without explicit considering of environment ...
Added: August 22, 2023
Azat F. Aminov, Alexey A. Sokolik, Yurii E. Lozovik, Physical Review B: Condensed Matter and Materials Physics 2023 Vol. 108 No. 11 Article 115415
We consider non-dissipative drag between Bose-condensed exciton polaritons in optical microcavity and embedded superconductors. This effect consists in induction of a non-dissipative electric current in the superconductor by motion of polariton Bose condensate due to electron-polariton interaction, or vice versa. Using many-body theory, we calculate the drag density, characterizing magnitude of this effect, with taking ...
Added: August 22, 2023
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
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
Matveenko S., Bahovadinov M. S., Baranov M. A. et al., Physical Review A: Atomic, Molecular, and Optical physics 2022 Vol. 106 No. 1 Article 013319
We discuss finite-temperature damping of rotons in elongated Bose-condensed dipolar gases, which are in the Thomas-Fermi regime in the tightly confined directions. The presence of many branches of excitations, which can participate in the damping process, is crucial for the Landau damping and results in significant increase of the damping rate. It is found, however, ...
Added: December 13, 2022
S. S. Gavrilov, Physical Review B: Condensed Matter and Materials Physics 2022 Vol. 106 No. 4 Article 045304
Theoretical study is performed of a single-mode polariton system with linear coupling of spin components. When combined with an ordinary two-particle interaction, the spin coupling involves a spontaneous symmetry breaking accompanied by a switch from linear to circular polarization under resonant driving. The asymmetric steady states can also lose stability, giving way to oscillatory and ...
Added: November 1, 2022