Polaritons and pairing phenomena in Bose-Hubbard mixtures

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 mo...

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Bibliographic Details
Published in:Physical review letters 2009-04, Vol.102 (13), p.135301-135301, Article 135301
Main Authors: Bhaseen, M J, Hohenadler, M, Silver, A O, Simons, B D
Format: Article
Language:English
Subjects:
BCS THEORY
BOSE-EINSTEIN GAS
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
HUBBARD MODEL
MIXTURES
PHASE DIAGRAMS
POLARONS
SIMULATION
SUPERFLUIDITY
SYMMETRY
U-1 GROUPS
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Summary: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)xU(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.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.102.135301