Critical velocities for a superfluid in a periodic potential

Details Critical velocities for a superfluid in a periodic potential Critical velocities for a superfluid in a periodic potential

2006-07-05

arxiv.org/abs/cond-mat/0607098v2

Physics

Condensed Matter

Superconductivity

extensive revision, 4 pages and 4 figures

Scientific paper

In contrast to the homogeneous superfluid which has only one critical velocity, there exist two critical velocities for a superfluid in a periodic potential. The first one, which we call inside critical velocity, is for a macroscopic impurity to move frictionlessly in the periodic superfluid system; the second, which is called trawler critical velocity, is the largest velocity of the lattice relative to the lab frame for the superfluidity to maintain. The results are relevant to the superfluidity observed in the Bose-Einstein condensate in an optical lattice and supersolid helium.

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