2008/12/31 by M. J. Bhaseen, Martin Hohenadler, M. Hohenadler +3 · 1 citation
Chemistry · Physics and Astronomy · #Cold Atom Physics and Bose-Einstein Condensates #Condensed matter physics #Excitation #Feshbach resonance #Hubbard model #Molecule #Mott insulator #Pairing #Phase (matter) #Phase diagram #Photoexcitation #Physics #Quantum #Quantum mechanics #Quasiparticle #Spectroscopy and Laser Applications #Strong Light-Matter Interactions #Superconductivity #Superfluidity #Ultracold atom #cond-mat.str-el #quant-ph
paper · pdf · doi:10.1103/physrevlett.102.135301
published as Phys. Rev. Lett. 102, 135301 (2009) · 4 pages, 3 figures
openalex publication_date 2009/03/30 · arxiv created 2009/03/31 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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.