Supersolid Bose-Fermi Mixtures in Optical Lattices

I. Titvinidze, M. Snoek, and W. Hofstetter
Phys. Rev. Lett. 100, 100401 – Published 10 March 2008

Abstract

We study a mixture of strongly interacting bosons and spinless fermions with on-site repulsion in a three-dimensional optical lattice. For this purpose we develop and apply a generalized dynamical mean-field theory, which is exact in infinite dimensions and reliably describes the full range from weak to strong coupling. We restrict ourselves to half filling. For weak Bose-Fermi repulsion a supersolid forms, in which bosonic superfluidity coexists with charge-density wave order. For stronger interspecies repulsion the bosons become localized while the charge-density wave order persists. The system is unstable against phase separation for weak repulsion among the bosons.

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  • Received 24 August 2007

DOI:https://doi.org/10.1103/PhysRevLett.100.100401

©2008 American Physical Society

Authors & Affiliations

I. Titvinidze, M. Snoek, and W. Hofstetter

  • Institut für Theoretische Physik, Johann Wolfgang Goethe-Universität, 60438 Frankfurt am Main, Germany

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Vol. 100, Iss. 10 — 14 March 2008

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