Zobrazeno 1 - 10
of 451
pro vyhledávání: '"Andreev, S. P."'
Autor:
Utesov, O. I., Andreev, S. V.
We extend our theory of slow magnons in a two-component Bose-Einstein condensate to the case of two spatial dimensions (2D). We provide a detailed discussion of polaronic corrections to the magnon branch of the elementary excitation spectrum in a wea
Externí odkaz:
http://arxiv.org/abs/2404.04440
Autor:
Andreev, S. V.
Publikováno v:
Phys. Rev. B 103, 184503 (2021)
We consider quantum phase transitions in a system of bright dipolar excitons which can form bound pairs (dipolar biexcitons). We assume a narrow resonance in the interaction of excitons with opposite spins. At sufficiently large density a resonant ex
Externí odkaz:
http://arxiv.org/abs/2007.06474
Publikováno v:
Phys. Rev. B 100, 235126 (2019)
We present a theoretical model of spin transitions in stacks of molecular layers. Our model captures the already established physics of these systems (thermal hysteretic transitions and crossovers) and suggests a way towards in situ control of this p
Externí odkaz:
http://arxiv.org/abs/1910.08618
Akademický článek
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Akademický článek
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Autor:
Andreev, S. V., Utesov, O. I.
Publikováno v:
Phys. Rev. A 101, 013621 (2020)
We consider a two-component Bose-condensed mixture characterized by positive s-wave scattering lengths. We assume equal densities and intra-species interactions. By doing the Bogoliubov transformation of an effective Hamiltonian we obtain the lower e
Externí odkaz:
http://arxiv.org/abs/1811.10099
Autor:
Donnerer, C., Sala, M. Moretti, Pascarelli, S., Rosa, A. D., Andreev, S. N., Mazurenko, V. V., Irifune, T., Hunter, E. C., Perry, R. S., McMorrow, D. F.
Publikováno v:
Physical Review B 97, 035106 (2018)
High-pressure x-ray absorption spectroscopy was performed at the Ir $L_3$ and $L_2$ absorption edges of Sr$_3$Ir$_2$O$_7$. The branching ratio of white line intensities continuously decreases with pressure, reflecting a reduction in the angular part
Externí odkaz:
http://arxiv.org/abs/1801.02234
Publikováno v:
Phys. Rev. A 97, 053617 (2018)
We generalize the Beliaev diagrammatic theory of an interacting spinless Bose-Einstein condensate to the case of a binary mixture. We derive a set of coupled Dyson equations and find analytically the Green's functions of the system. The elementary ex
Externí odkaz:
http://arxiv.org/abs/1712.00039
Autor:
Andreev, S. V., Nalitov, A. V.
Publikováno v:
Phys. Rev. B 97, 165139 (2018)
We present a theoretical model of a driven-dissipative spin-orbit coupled Bose-Einstein condensate of indirect excitons in semiconductor quantum wells (QW's). Our steady-state solution of the problem shares analogies with the Hanle effect in an optic
Externí odkaz:
http://arxiv.org/abs/1704.08961
Autor:
Andreev, S. V.
Publikováno v:
Phys. Rev. B 95, 184519 (2017)
We discuss a possible link between the recently observed macroscopic ordering of ultra cold dipolar excitons (MOES) and the phenomenon of supersolidity. In the dilute limit we predict a stable supersolid state for a quasi-one-dimensional system of bo
Externí odkaz:
http://arxiv.org/abs/1701.05621