Effect of the Zero-Mode on the Response of a Trapped Bose-Condensed Gas(Condensed Matter and Statistical Physics)
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概要
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The dynamical response of a trapped Bose-Einstein condensate (BEC) is formulated consistently with quantum field theory and is numerically evaluated. We regard the BEC as a manifestation of the breaking of the global phase symmetry. Then, the Goldstone theorem implies the existence of a zero energy excitation mode (the zero-mode). We calculate the effect of the zero-mode on the response frequency and show that the contribution of the zero-mode to the first excitation mode is not so important in the parameter set realized in the existing experiment. This is the reason that experimental results can be described using the Bogoliubov prescription, although it breaks the consistency of the description in quantum field theory.
- 理論物理学刊行会の論文
- 2006-04-25
著者
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YAMANAKA Yoshiya
Department of Physics, Waseda University
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Okumura Masahiko
Department Of Central Radiological Service Kinki University School Of Medicine
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Yamanaka Yoshiya
Department Of Materials Science And Engineering Waseda University
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MINE Makoto
Department of Physics, Waseda University
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KOIDE Tomoi
Institute de Fisica, Universidade de Sao Paulo, C.P.
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Koide Tomoi
Institute De Fisica Universidade De Sao Paulo C.p.
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Mine Makoto
Department Of Internal Medicine Saga Medical School
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Okumura M
Ccse Japan Atomic Energy Agency
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Yamanaka Yoshiya
Department Of Electronic And Photonic Systems Waseda University
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OKUMURA Masahiko
Department of Applied Physics, Waseda University
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