Unifying treatment of nonequilibrium and unstable dynamics of cold bosonic atom system with time-dependent order parameter in Thermo Field Dynamics

Y. Nakamura*, Y. Yamanaka

*この研究の対応する著者

研究成果: Article査読

5 被引用数 (Scopus)

抄録

The coupled equations which describe the temporal evolution of the Bose-Einstein condensed system are derived in the framework of nonequilibrium Thermo Field Dynamics. The key element is that they are not the naive assemblages of assumed equations, but are the self-consistent ones derived by appropriate renormalization conditions. While the order parameter is time-dependent, an explicit quasiparticle picture is constructed by a time-dependent expansion. Our formulation is valid even for the system with a unstable condensate, and describes the condensate decay caused by the Landau instability as well as by the dynamical one.

本文言語English
ページ(範囲)1070-1083
ページ数14
ジャーナルAnnals of Physics
326
4
DOI
出版ステータスPublished - 2011 4

ASJC Scopus subject areas

  • 物理学および天文学(全般)

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