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

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

1998-02-24

arxiv.org/abs/cond-mat/9802247v1

Physics

Condensed Matter

8 pages, 5 figures, uses REVTex

Scientific paper

10.1103/PhysRevA.58.1440

We numerically calculate the 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.

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