Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2003-01-02
Phys. Rev. A. 67(2003) 053613
Physics
Condensed Matter
Soft Condensed Matter
15 pages, 7 figures
Scientific paper
10.1103/PhysRevA.67.053613
We investigate the band structure of a Bose-Einstein condensate in a one-dimensional periodic potential by calculating stationary solutions of the Gross-Pitaevskii equation which have the form of Bloch waves. We demonstrate that loops ("swallow tails") in the band structure occur both at the Brillouin zone boundary and at the center of the zone, and they are therefore a generic feature. A physical interpretation of the swallow tails in terms of periodic solitons is given. The linear stability of the solutions is investigated as a function of the strength of the mean-field interaction, the magnitude of the periodic potential, and the wave vector of the condensate. The regions of energetic and dynamical stability are identified by considering the behavior of the Gross-Pitaevskii energy functional for small deviations of the condensate wave function from a stationary state. It is also shown how for long-wavelength disturbances the stability criteria may be obtained within a hydrodynamic approach.
Machholm Mette
Pethick Christopher J.
Smith Hal
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