Low Temperature Physics: 37, 561 (2011); https://doi.org/10.1063/1.3633685 (6 pages)
Fizika Nizkikh Temperatur: Volume 37, Number 7 (July 2011), p. 708-714    ( to contents , go back )

Green's function method to the ground state properties of a two-component Bose-Einstein condensate

Chen Liang, Kong Wei, B.J. Ye, H.M. Wen, X.Y. Zhou, and R.D. Han

Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China
E-mail: phychl@mail.ustc.edu.cn
pos Анотація:

Received November 25, 2010

Abstract

The elementary excitation spectrum of a two-component Bose–Einstein condensate is obtained by Green’s function method. It is found to have two branches. In the long-wave limit, the two branches of the excitation spectrum are reduced to one phonon excitation and one single-particle excitation. With the obtained excitation spectrum and the Green’s functions, the depletion of the condensate and the ground state energy have also been calculated in this paper.

PACS: 03.75.Nt Other Bose–Einstein condensation phenomena.

Key words: Green’s function, elementary excitation, Bose–Einstein condensate.

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