Polaritons and Pairing Phenomena in Bose-Hubbard Mixtures

M. J. Bhaseen, M. Hohenadler, A. O. Silver, and B. D. Simons
Phys. Rev. Lett. 102, 135301 – Published 30 March 2009

Abstract

Motivated by recent experiments on cold atomic gases in ultrahigh finesse optical cavities, we consider the two-band Bose-Hubbard model coupled to quantum light. Photoexcitation promotes carriers between the bands, and we study the interplay between Mott insulating behavior and superfluidity. The model displays a U(1)×U(1) symmetry which supports the coexistence of Mott insulating and superfluid phases and yields a rich phase diagram with multicritical points. This symmetry is shared by several other problems of current experimental interest, including two-component Bose gases in optical lattices and the bosonic BEC-BCS crossover for atom-molecule mixtures induced by a Feshbach resonance. We corroborate our findings by numerical simulations.

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  • Received 23 December 2008

DOI:https://doi.org/10.1103/PhysRevLett.102.135301

©2009 American Physical Society

Authors & Affiliations

M. J. Bhaseen, M. Hohenadler*, A. O. Silver, and B. D. Simons

  • Cavendish Laboratory, University of Cambridge, Cambridge, CB3 0HE, United Kingdom

  • *Present address: OSRAM Opto Semiconductors GmbH, 93055 Regensburg, Germany.

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Vol. 102, Iss. 13 — 3 April 2009

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