Zobrazeno 1 - 10
of 400
pro vyhledávání: '"Yu. E. Lozovik"'
Publikováno v:
Quantum, Vol 7, p 1144 (2023)
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
Externí odkaz:
https://doaj.org/article/1a70d6677f8549878ee9528d21524d2a
Autor:
T. T. Sergeev, A. A. Zyablovsky, E. S. Andrianov, A. A. Pukhov, Yu. E. Lozovik, A. P. Vinogradov
Publikováno v:
Scientific Reports, Vol 11, Iss 1, Pp 1-11 (2021)
Abstract We demonstrate a new type of non-Hermitian phase transition in open systems far from thermal equilibrium, which can have place in the absence of an exceptional point. This transition takes place in coupled systems interacting with reservoirs
Externí odkaz:
https://doaj.org/article/5efc97f62b2044a0b71d9b1338ccb3a7
Publikováno v:
Quantum, Vol 7, p 982 (2023)
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 th
Externí odkaz:
https://doaj.org/article/3d7e3b75e3b04b19a05299e6279aa7c6
Publikováno v:
Quantum, Vol 6, p 719 (2022)
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 o
Externí odkaz:
https://doaj.org/article/7d5e39b134094f90bd239ce4a729d1f6
Publikováno v:
Crystals, Vol 8, Iss 6, p 246 (2018)
Ground-state properties of bosons interacting via inverse square potential (three dimensional Calogero-Sutherland model) are analyzed. A number of quantities scale with the density and can be naturally expressed in units of the Fermi energy and Fermi
Externí odkaz:
https://doaj.org/article/b51875db0add482abdcd082814ee32ca
Autor:
Nikolai A. Poklonski, Nguyen N. Hieu, A.I. Siahlo, Yu. E. Lozovik, Sergey A. Vyrko, A. T. Vlassov, S. V. Ratkevich
Publikováno v:
Proceedings of the National Academy of Sciences of Belarus. Physics and Mathematics Series. 56:411-418
The work was supported by the Belarusian National Research Program “Convergence-2020” and the Belarusian Republican Foundation for Fundamental Research (grant no. Ф20Р-301). Yurii E. Lozovik acknowledge support by the Russian Foundation of Basi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a54c9e954637e2789a4ad22810c36ae5
https://doi.org/10.29235/1561-2430-2020-56-4-411-418
https://doi.org/10.29235/1561-2430-2020-56-4-411-418
Autor:
Yu. E. Lozovik, A.I. Siahlo, A. T. Vlassov, Nguyen N. Hieu, S. V. Ratkevich, Sergey A. Vyrko, Nikolai A. Poklonski
Publikováno v:
Semiconductors. 54:1678-1681
Using the semi-empirical quantum chemical PM3 method the energies of carbon nanoscrolls formed from flat zigzag graphene nanoribbons 46zGNR and 70zGNR are calculated. For this purpose a simple algorithm to define the Cartesian coordinates of the atom
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::18186c768f1fde26444445350e327fbe
https://doi.org/10.1134/s1063782620120350
https://doi.org/10.1134/s1063782620120350
Publikováno v:
JETP Letters. 109:606-609
The phonon and electronic properties, the Eliashberg function and the temperature dependence of resistance of electride Ca2N are investigated by the DFT-LDA (density functional theory in local density approximation) plane-wave method. The phonon disp
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8001a012b3c9c68e7e4340934222afed
https://doi.org/10.1134/s0021364019090029
https://doi.org/10.1134/s0021364019090029
Publikováno v:
UPCommons. Portal del coneixement obert de la UPC
Universitat Politècnica de Catalunya (UPC)
Universitat Politècnica de Catalunya (UPC)
Ensembles with long-range interactions between particles are promising for revealing strong quantum collective effects and many-body phenomena. Here we study the ground-state phase diagram of a two-dimensional Bose system with quadrupolar interaction
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::fcb4da7ae692a5268e81a9cbcce1131d
https://hdl.handle.net/2117/353452
https://hdl.handle.net/2117/353452
Publikováno v:
UPCommons. Portal del coneixement obert de la UPC
Universitat Politècnica de Catalunya (UPC)
Universitat Politècnica de Catalunya (UPC)
We present an analytical method to estimate the condensate fraction $n_0/n$ in strongly correlated systems for which the zero-temperature static structure factor $S({\bf p})$ is known. The advantage of the proposed method is that it allows one to pre
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8ce25b6259a76c0400df525208efb2a2
https://hdl.handle.net/2117/353451
https://hdl.handle.net/2117/353451