Landau critical velocity in weakly interacting Bose gases

TY - JOUR

T1 - Landau critical velocity in weakly interacting Bose gases

AU - Baym, Gordon Alan

AU - Pethick, C. J.

PY - 2012/8/2

Y1 - 2012/8/2

N2 - The flow of a uniform Bose gas at speeds greater than the Landau critical velocity v c does not necessarily destroy superfluidity, but rather needs only to lead to a decrease of the superfluid mass density ρ s. Analyzing a weakly interacting Bose gas with a finite-range interparticle interaction that leads to a Landau critical velocity at nonzero quasiparticle momentum, we explicitly construct the (nonuniform) condensate for fluid flow faster than v c and calculate the accompanying decrease in ρ 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.

AB - The flow of a uniform Bose gas at speeds greater than the Landau critical velocity v c does not necessarily destroy superfluidity, but rather needs only to lead to a decrease of the superfluid mass density ρ s. Analyzing a weakly interacting Bose gas with a finite-range interparticle interaction that leads to a Landau critical velocity at nonzero quasiparticle momentum, we explicitly construct the (nonuniform) condensate for fluid flow faster than v c and calculate the accompanying decrease in ρ 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.

U2 - 10.1103/PhysRevA.86.023602

DO - 10.1103/PhysRevA.86.023602

M3 - Journal article

SN - 2469-9926

VL - 86

SP - 023602

JO - Physical Review A (Atomic, Molecular and Optical Physics)

JF - Physical Review A (Atomic, Molecular and Optical Physics)

IS - 2

ER -