Staggered-vortex superfluid of ultracold bosons in an optical lattice

L.K. Lim, C. de Morais Smith, Andreas Hemmerich

Research output: Contribution to journalArticleAcademicpeer-review


We show that the dynamics of cold bosonic atoms in a two-dimensional square optical lattice produced by a bichromatic light-shift potential is described by a Bose-Hubbard model with an additional effective staggered magnetic field. In addition to the known uniform superfluid and Mott insulating phases, the zero-temperature phase diagram exhibits a novel kind of finite-momentum superfluid phase, characterized by a quantized staggered rotational flux. An extension for fermionic atoms leads to an anisotropic Dirac spectrum, which is relevant to graphene and high-Tc superconductors.
Original languageUndefined/Unknown
Pages (from-to)1-4
Number of pages4
JournalPhysical Review Letters
Issue number130402
Publication statusPublished - 2008

Cite this