2 papers
cond-mat2001
Vortex stabilization in a small rotating asymmetric Bose-Einstein condensate
Marion Linn, Matthias Niemeyer, Alexander L. Fetter
We use a variational method to investigate the ground-state phase diagram of a small, asymmetric Bose-Einstein condensate with respect to the dimensionless interparticle interactio…
cond-mat.str-el1998
Strong-coupling perturbation theory for the two-dimensional Bose-Hubbard model in a magnetic field
M. Niemeyer, J. K. Freericks, H. Monien
The Bose-Hubbard model in an external magnetic field is investigated with strong-coupling perturbation theory. The lowest-order secular equation leads to the problem of a charged p…