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  Ramifications of topology and thermal fluctuations in quasi-2D condensates

Roy, A., & Angom, D. (2017). Ramifications of topology and thermal fluctuations in quasi-2D condensates. Journal of Physics B, 50(22): 225301. doi:10.1088/1361-6455/aa8e3c.

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Roy, Arko1, Author           
Angom, D.2, Author
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1Max Planck Institute for the Physics of Complex Systems, Max Planck Society, ou_2117288              
2external, ou_persistent22              

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 MPIPKS: Ultracold matter
 Abstract: We explore the topological transformation of quasi-2D Bose-Einstein condensates of dilute atomic gases, and changes in the collective modes as the confining potential is modified from rotationally symmetric multiply connected to multiply connected with broken rotational symmetry and ultimately to a simply connected geometry. In particular, we show that the condensate density, and the non-condensate density arising from the quantum fluctuations, follow the transition in the geometry of the confining potential. The non-condensate density arising from the thermal fluctuations, in contrast, remain multiply connected when the thermal energy exceeds the maximum value in the basin of the confining potential. Otherwise, both the condensate and non-condensate densities become simply connected. The topology of the non-condensate densities is determined by the thermal energy, the repulsive interaction energy between atoms, and the trapping potential energy. In particular, the origin of the difference lies in the structure of the low-energy collective modes, which we examine using the Hartree-Fock-Bogoliubov formalism. We then use the Hartree-Fock-Bogoliubov theory with the Popov approximation to investigate the density and the momentum distribution associated with the thermal fluctuations.

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Language(s): eng - English
 Dates: 2017-10-312017-11-28
 Publication Status: Issued
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 Identifiers: ISI: 000414273000001
DOI: 10.1088/1361-6455/aa8e3c
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Title: Journal of Physics B
  Other : Journal of Physics B: Atomic, Molecular and Optical Physics
Source Genre: Journal
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Publ. Info: Bristol : IOP Publishing
Pages: - Volume / Issue: 50 (22) Sequence Number: 225301 Start / End Page: - Identifier: CoNE: https://pure.mpg.de/cone/journals/resource/0022-3700