Comment on ``Nonlinear band structure in Bose-Einstein condensates: Nonlinear Schödinger equation with a Kronig Penney potential"

Details Comment on ``Nonlinear band structure in Bose-Einstein condensates: Nonlinear Schödinger equation with a Kronig Penney potential" Comment on ``Nonlinear band structure in Bose-Einstein condensates: Nonlinear Schödinger equation with a Kronig Penney potential"

2007-03-02

arxiv.org/abs/cond-mat/0703045v2

Phys. Rev. A 76, 017601 (2007)

Physics

Condensed Matter

Other Condensed Matter

3 pages, 3 figures

Scientific paper

10.1103/PhysRevA.76.017601

In their recent paper [Phys. Rev. A 71, 033622], B. T. Seaman et al. studied Bloch states of the condensate wave function in a Kronig-Penney potential and calculated the band structure. They argued that the effective mass is always positive when a swallow-tail energy loop is present in the band structure. In this comment, we reexamine their argument by actually calculating the effective mass. It is found that there exists a region where the effective mass is negative even when a swallow-tail is present. Based on this fact, we discuss the interpretation of swallow-tails in terms of superfluidity.

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