Excitation spectrum and instability of a two-species Bose-Einstein condensate

被引:76
作者
Gordon, D [1 ]
Savage, CM [1 ]
机构
[1] Australian Natl Univ, Dept Phys & Theoret Phys, Canberra, ACT 0200, Australia
来源
PHYSICAL REVIEW A | 1998年 / 58卷 / 02期
关键词
D O I
10.1103/PhysRevA.58.1440
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
We numerically calculate the zero-temperature density profile and excitation spectrum of a two-species Bose-Einstein condensate for the parameters of recent experiments. We find that the ground-state density profile of this system becomes unstable in certain parameter regimes, which leads to a phase transition to a new stable state. This state displays spontaneously broken cylindrical symmetry. This behavior is reflected in the excitation spectrum: As we approach the phase transition point, the lowest excitation frequency goes to zero, indicating the onset of instability in the density profile. Following the phase transition, this frequency rises again. [S1050-2947(98)02408-1].
引用
收藏
页码:1440 / 1444
页数:5
相关论文
共 15 条
[1]   Stability and collective excitations of a two-component Bose-Einstein condensed gas: A moment approach [J].
Busch, T ;
Cirac, JI ;
Perez-Garcia, VM ;
Zoller, P .
PHYSICAL REVIEW A, 1997, 56 (04) :2978-2983
[2]   Zero-temperature, mean-field theory of atomic Bose-Einstein condensates [J].
Edwards, M ;
Dodd, RJ ;
Clark, CW ;
Burnett, K .
JOURNAL OF RESEARCH OF THE NATIONAL INSTITUTE OF STANDARDS AND TECHNOLOGY, 1996, 101 (04) :553-565
[3]   Low-lying excitations of double Bose-Einstein condensates [J].
Esry, BD ;
Greene, CH .
PHYSICAL REVIEW A, 1998, 57 (02) :1265-1271
[4]   Hartree-Fock theory for double condensates [J].
Esry, BD ;
Greene, CH ;
Burke, JP ;
Bohn, JL .
PHYSICAL REVIEW LETTERS, 1997, 78 (19) :3594-3597
[5]   Collective excitations of trapped binary mixtures of Bose-Einstein condensed gases [J].
Graham, R ;
Walls, D .
PHYSICAL REVIEW A, 1998, 57 (01) :484-487
[6]  
HALL DS, CONDMAT9805327
[7]  
HALL DS, CONDMAT9804138
[8]   Binary mixtures of bose condensates of alkali atoms [J].
Ho, TL ;
Shenoy, VB .
PHYSICAL REVIEW LETTERS, 1996, 77 (16) :3276-3279
[9]  
LIFSHITZ EM, 1980, STAT PHYSICS 2
[10]  
MATTHEWS M, UNPUB COMMUNICATION