Two-Fluid Hydrodynamics in Trapped Bose Gases and in Superfluid Helium
Abstract
A review is given of recent theoretical work on the superfluid dynamics of trapped Bose gases at finite temperatures, where there is a significant fraction of non-condensate atoms. One can now reach large enough densities and collision cross-sections needed to probe the collective modes in the collision-dominated hydrodynamic region where the gas exhibits characteristic superfluid behavior involving the relative motions of the condensate and non-condensate components. The precise analogue of the Landau-Khalatnikov two-fluid hydrodynamic equations was recently derived from trapped Bose gases, starting from a generalized Gross-Pitaevskii equation for the condensate macroscopic wavefunction and a kinetic equation for the non-condensate atoms.
Cite
@article{arxiv.cond-mat/0009282,
title = {Two-Fluid Hydrodynamics in Trapped Bose Gases and in Superfluid Helium},
author = {Allan Griffin and Tetsuro Nikuni},
journal= {arXiv preprint arXiv:cond-mat/0009282},
year = {2007}
}
Comments
Invited paper to appear in Proceedings of International Symposium on Quantum Fluids and Solids, Minneapolis, June, 2000, J. Low Temp. Physics