%0 Journal Article
%T Landau critical velocity in weakly interacting Bose gases
%A Gordon Baym
%A C. J. Pethick
%J Physics
%D 2012
%I arXiv
%R 10.1103/PhysRevA.86.023602
%X The flow of a uniform Bose gas at speeds greater than the Landau critical velocity, v_c, does not necessarily destroy superfluidity, but rather need only lead to a decrease of the superfluid mass density, {\rho}_s. Analyzing a weakly interacting Bose gas with a finite range interparticle interaction that leads to a Landau critical velocity at non-zero quasiparticle momentum, we explicitly construct the (non-uniform) condensate for fluid flow faster than v_c and calculate the accompanying decrease in {\rho}_s. We briefly comment on the relation of the physics to other problems in superfluids, e.g., solitons, and vortices in Bose-Einstein condensates, and critical currents in superconductors.
%U http://arxiv.org/abs/1206.7066v1