Superfluid drag of two-species Bose-Einstein condensates in optical lattices
Abstract
We study two-species Bose-Einstein condensates in quasi two-dimensional optical lattices of varying geometry and potential depth. Based on the numerically exact Bloch and Wannier functions obtained using the plane-wave expansion method, we quantify the drag (entrainment coupling) between the condensate components. This drag originates from the (short range) inter-species interaction and increases with the kinetic energy. As a result of the interplay between interaction and kinetic energy effects, the superfluid-drag coefficient shows a non-monotonic dependence on the lattice depth. To make contact with future experiments, we quantitatively investigate the drag for mass ratios corresponding to relevant atomic species.
Keywords
Cite
@article{arxiv.1208.1659,
title = {Superfluid drag of two-species Bose-Einstein condensates in optical lattices},
author = {Patrick P. Hofer and C. Bruder and Vladimir M. Stojanovic},
journal= {arXiv preprint arXiv:1208.1659},
year = {2012}
}
Comments
6 pages, 4 figures. Accepted in its original form but minor changes have been done