Thursday, August 9, 2012

1208.1659 (Patrick P. Hofer et al.)

Superfluid drag of two-species Bose-Einstein condensates in optical
lattices
   [PDF]

Patrick P. Hofer, C. Bruder, Vladimir M. Stojanovic
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.
View original: http://arxiv.org/abs/1208.1659

No comments:

Post a Comment