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Phys. Rev. Lett. 96, 180406 (2006) [4 pages]

Vortex-Peierls States in Optical Lattices

A. A. Burkov and Eugene Demler
Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA
Received 14 February 2006; published 10 May 2006

We show that vortices, induced in cold atom superfluids in optical lattices, may order in a novel vortex-Peierls ground state. In such a state vortices do not form a simple lattice but arrange themselves in clusters, within which the vortices are partially delocalized, tunneling between classically degenerate configurations. We demonstrate that this exotic quantum many-body state is selected by an order-from-disorder mechanism for a special combination of the vortex filling and lattice geometry that has a macroscopic number of classically degenerate ground states.

©2006 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevLett.96.180406
DOI: 10.1103/PhysRevLett.96.180406
PACS: 05.30.Jp; 03.75.Lm; 67.90.+z; 74.81.Fa
  • 05.30.Jp
    Boson systems (quantum statistical mechanics)
  • 03.75.Lm
    Josephson effect, tunneling, Bose-Einstein condensates in periodic potentials, solitons, vortices, and topological excitations
  • 67.90.+z
    Other topics in quantum fluids and solids; liquid and solid helium (restricted to new topics in section 67)
  • 74.81.Fa
    Josephson junction arrays and superconducting wire networks
  • YEAR: 2006
KEYWORDS: vortices, superfluidity, many-body problems, boson systems

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