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Bogolon-mediated light absorption in atomic condensates of different dimensionality

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Title
Bogolon-mediated light absorption in atomic condensates of different dimensionality
Author(s)
Dogyun Ko; Meng Sun; Kovalev, Vadim; Ivan Savenko
Publication Date
2023-04
Journal
Scientific Reports, v.13, no.1
Publisher
Nature Research
Abstract
In the case of structureless bosons, cooled down to low temperatures, the absorption of electromagnetic waves by their Bose-Einstein condensate is usually forbidden due to the momentum and energy conservation laws: the phase velocity of the collective modes of the condensate called bogolons is sufficiently lower than the speed of light. Thus, only the light scattering processes persist. However, the situation might be different in the case of composite bosons or the bosons with an internal structure. Here, we develop a microscopic theory of electromagnetic power absorption by a Bose–Einstein condensates of cold atoms in various dimensions, utilizing the Bogoliubov model of a weakly-interacting Bose gas. Thus, we address the transitions between a collective coherent state of bosons and the discrete energy levels corresponding to excited internal degrees of freedom of non-condensed individual bosons. It is shown, that such transitions are mediated by one and two-bogolon excitations above the condensate, which demonstrate different efficiency at different frequencies and strongly depend on the condensate density, which influence varies depending on the dimensionality of the system. © 2023, The Author(s).
URI
https://pr.ibs.re.kr/handle/8788114/13449
DOI
10.1038/s41598-023-33091-5
ISSN
2045-2322
Appears in Collections:
Center for Theoretical Physics of Complex Systems(복잡계 이론물리 연구단) > 1. Journal Papers (저널논문)
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