1. Green’s function method to the ground state properties of a two-component Bose–Einstein condensate
- Author
-
H. M. Wen, R. D. Han, Kong Wei, X. Y. Zhou, Bangjiao Ye, and Chen Liang
- Subjects
Бозе-эйнштейновская конденсация ,Condensed Matter::Quantum Gases ,Physics ,Physics and Astronomy (miscellaneous) ,Phonon ,Component (thermodynamics) ,Spectrum (functional analysis) ,General Physics and Astronomy ,law.invention ,symbols.namesake ,law ,Green's function ,Excited state ,symbols ,Atomic physics ,Ground state ,Bose–Einstein condensate ,Excitation - 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.
- Published
- 2011
- Full Text
- View/download PDF