Superconductor-insulator phase transition in the boson Hubbard model

Journal Article · Fri Jan 01 04:00:00 EST 1993 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.47.279· OSTI ID:7118775

Kampf, A P ^[1]; Zimanyi, G T ^[2]

---

1. Institut fuer Festkoerperforschung, Forschungszentrum Juelich, W-5170 Juelich (Germany)
2. Institute for Theoretical Physics, University of California, Santa Barbara, California 93106 (United States) Department of Physics, University of California, Davis, California 95616 (United States)

We investigate the superconductor-insulator phase transition in the two-dimensional boson Hubbard system with short-range interactions. Fluctuations of [ital both] the phase and the amplitude of the superfluid order parameter are included in the determination of the phase diagram at zero and finite temperatures. The mean-field phase boundary is compared to quantum Monte Carlo results. We also calculate the frequency-dependent conductivity in the vicinity of the phase transition and find it universal at the multicritical point.

• OSTI ID: 7118775
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 47:1; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

665411* -- Basic Superconductivity Studies-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BOSONS
CALCULATION METHODS
DIAGRAMS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
FLUCTUATIONS
FREQUENCY DEPENDENCE
MEAN-FIELD THEORY
MONTE CARLO METHOD
ORDER PARAMETERS
PHASE DIAGRAMS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
SUPERCONDUCTORS
TEMPERATURE EFFECTS
VARIATIONS