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Orbital order of spinless fermions near an optical Feshbach resonance

Source: Phys. Rev. A 84, 051603 (2011); http://dx.doi.org/10.1103/PhysRevA.84.051603

Published 21 November 2011

PACS
  • 03.75.Ss
    Degenerate Fermi gases
  • 05.30.Fk
    Fermion systems and electron gas (quantum statistical mechanics)
  • 67.85.-d
    Ultracold gases, trapped gases (quantum fluids)
  • 71.10.Fd
    Lattice fermion models (condensed matter)
  • YEAR: 2011
PUBLICATION DATA
ISSN:
1935-4061 (online)
Publisher:
AIP is a member of CrossRef APS
Philipp Hauke,1,2 Erhai Zhao,2,3 Krittika Goyal,4 Ivan H. Deutsch,4 W. Vincent Liu,2,5 and Maciej Lewenstein1,2,6
1ICFO–Institut de Ciències Fotòniques, Parc Mediterrani de la Tecnologia, E-08860 Castelldefels, Spain
2Kavli Institute for Theoretical Physics, University of California, Santa Barbara, California 93106, USA
3Department of Physics and Astronomy, George Mason University, Fairfax, Virginia 22030, USA
4Center for Quantum Information and Control (CQuIC), and Department of Physics and Astronomy, University of New Mexico, Albuquerque, New Mexico 87131, USA
5Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA
6ICREA–Institució Catalana de Recerca i Estudis Avançats, Lluis Companys 23, E-08010 Barcelona, Spain
We study the quantum phases of a three-color Hubbard model that arises in the dynamics of the p-band orbitals of spinless fermions in an optical lattice. Strong, color-dependent interactions are induced by an optical Feshbach resonance. Starting from the microscopic scattering properties of ultracold atoms, we derive the orbital exchange constants at 1/3 filling on the cubic optical lattice. Using this, we compute the phase diagram in a Gutzwiller ansatz. We find phases with “axial orbital order” in which pz and px+ipy (or px−ipy) orbitals alternate.
History: Received 6 April 2011; published 21 November 2011
Digital Object Identifier: http://dx.doi.org/10.1103/PhysRevA.84.051603
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