Orbital order of spinless fermions near an optical Feshbach resonance

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 ultracol...

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Bibliographic Details
Published in:Physical Review A
Main Authors: Hauke, Philipp, Zhao, Erhai, Goyal, Krittika, Deutsch, Ivan H., Liu, W. Vincent, Lewenstein, Maciej
Format: Article in Journal/Newspaper
Language:English
Published: 2011
Subjects:
IPY
Online Access:http://hdl.handle.net/11572/252200
https://doi.org/10.1103/PhysRevA.84.051603
https://journals.aps.org/pra/abstract/10.1103/PhysRevA.84.051603
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Summary: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 p z and px+ipy (or px-ipy) orbitals alternate. © 2011 American Physical Society.

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