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

  • Patrick P. Hofer
  • C. Bruder
  • Vladimir M. Stojanović
Publishing year: 2012-09-24
Language: English
Publication/Series: Physical Review A (Atomic, Molecular and Optical Physics)
Volume: 86
Issue: 3
Document type: Journal article
Publisher: American Physical Society

Abstract english

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) interspecies 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 nonmonotonic dependence on the lattice depth. To make contact with future experiments, we quantitatively investigate the drag for mass ratios corresponding to relevant atomic species.


  • ISSN: 1050-2947
Portrait of Patrick Potts
E-mail: patrick [dot] potts [at] teorfys [dot] lu [dot] se

Postdoctoral fellow

Mathematical Physics


Postdoctoral fellow