Bose-Hubbard model in the presence of Ohmic dissipation

Journal Article · Fri May 15 04:00:00 EDT 2009 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.79.053611· OSTI ID:21304729

Dalidovich, Denis; Kennett, Malcolm P ^[1]

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1. Department of Physics, Simon Fraser University, 8888 University Drive, Burnaby, British Columbia, V5A 1S6 (Canada)

We study the zero temperature mean-field phase diagram of the Bose-Hubbard model in the presence of local coupling between the bosons and an external bath. We consider a coupling that conserves the on-site occupation number, preserving the robustness of the Mott-insulator and superfluid phases. We show that the coupling to the bath renormalizes the chemical potential and the interaction between the bosons and reduces the size of the superfluid regions between the insulating lobes. For strong enough coupling, a finite value of hopping is required to obtain superfluidity around the degeneracy points where Mott-insulator phases with different occupation numbers coexist.

• OSTI ID: 21304729
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 5 Vol. 79; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BOSONS
COUPLING
HUBBARD MODEL
INTERACTIONS
MEAN-FIELD THEORY
METALS
OCCUPATION NUMBER
PHASE DIAGRAMS
POTENTIALS
RENORMALIZATION
SUPERFLUIDITY