Critical velocities in two-component superfluid Bose gases
Other Condensed Matter
2009-11-13 v1
Abstract
On the ground of the Landau criterion we study the behavior of critical velocities in a superfluid two-component Bose gas. It is found that under motion of the components with different velocities the velocity of each component should not be lower than a minimum phase velocity of elementary excitations (s_). The Landau criterion yields a relation between the critical velocities of the components (v_{c1}, v_{c2}). The velocity of one or even both components may exceed s_. The maximum value of the critical velocity of a given component can be reached when the other component does not move. The approach is generalized for a two-component condensate confined in a cylindrical harmonic potential. PACS numbers: 03.75.Kk,03.75.Mn
Cite
@article{arxiv.0807.0726,
title = {Critical velocities in two-component superfluid Bose gases},
author = {L. Yu. Kravchenko and D. V. Fil},
journal= {arXiv preprint arXiv:0807.0726},
year = {2009}
}
Comments
6 pages, 1 figures