Quantum field theoretical description of unstable behavior of a Bose-Einstein condensate with a highly quantized vortex in a harmonic potential

M. Okumura*, M. Mine, T. Sunaga, Y. Yamanaka

*この研究の対応する著者

研究成果: Article査読

抄録

The Bogoliubov-de Gennes equations are used for a number of theoretical works to describe quantum and thermal fluctuations of trapped Bose-Einstein condensates. We consider the case in which the condensate has a highly quantized vortex. It is known that these equations have complex eigenvalues in this case. We give the complete set including a pair of complex modes whose eigenvalues are complex conjugates to each other. The expansion of the quantum fields which represent neutral atoms in terms of the complete set brings the operators associated with the complex modes, which are simply neither bosonic nor fermionic ones. The eigenstate of the Hamiltonian is given. Introducing the notion of the physical states, we discuss the instability of the condensates in the context of Kubo's linear response theory.

本文言語English
ページ(範囲)211-214
ページ数4
ジャーナルLaser Physics
17
2
DOI
出版ステータスPublished - 2007 2月

ASJC Scopus subject areas

  • 原子分子物理学および光学
  • 器械工学
  • 凝縮系物理学
  • 産業および生産工学

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