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.
