Staggered-Vortex Superfluid of Ultracold Bosons in an Optical Lattice
Journal Article
·
· Physical Review Letters
- Institute for Theoretical Physics, Utrecht University, 3508 TD Utrecht (Netherlands)
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-T{sub c} superconductors.
- OSTI ID:
- 21123795
- Journal Information:
- Physical Review Letters, Vol. 100, Issue 13; Other Information: DOI: 10.1103/PhysRevLett.100.130402; (c) 2008 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
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