Ground-state phase diagram of an interacting Bose model with near-neighbor repulsion

Journal Article · Tue Oct 01 04:00:00 EDT 1991 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.44.7143· OSTI ID:5246967

Niyaz, P; Scalettar, R T; Fong, C Y ^[1]; Batrouni, G G ^[2]

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1. Department of Physics, University of California, Davis, Davis, California (USA)
2. Lawrence Livermore National Laboratory, The University of California, P.O. Box 808, Livermore, California (USA)

We study the ground-state phase diagram of a one-dimensional lattice model of interacting bosons at commensurate filling. When the ratio of interaction strengths to bandwidth is small, the bosons condense into a superfluid phase. For large on-site repulsion, there is a phase transition to a localized Mott phase where the gap {Delta} is nonzero and the Fourier transform at zero momentum of the density-density correlation function {ital S}({ital q}=0) diverges. For large intersite repulsion, {ital S}({ital q}={pi}) diverges first. By examining the superfluid density {rho}{sub {ital s}}, in addition to the gap and {ital S}({ital q}), we obtain a complete characterization of the phase diagram.

• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 5246967
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 44:13; ISSN 0163-1829; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

640450* -- Fluid Physics-- Superfluidity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BOSE-EINSTEIN CONDENSATION
BOSONS
CORRELATION FUNCTIONS
DIAGRAMS
ENERGY LEVELS
FLUIDS
FUNCTIONS
GROUND STATES
PHASE DIAGRAMS
QUANTUM FLUIDS
SUPERFLUIDITY