Numerical study of the onset of superfluidity in two-dimensional, disordered, hard-core bosons

The ground-state of hard-core bosons in a random one-body potential is studied numerically to observe the transition from superfluid to insulating Bose glass'' phase. Finite-size scaling analyses are performed to estimate the transition point and critical exponents. The dynamical critical...

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Bibliographic Details
Published in:Physical review. B, Condensed matter Condensed matter, 1992-06, Vol.45 (22), p.13136-13139
Main Author: RUNGE, K. J
Format: Article
Language:English
Subjects:
665420 - Superfluidity- (1992-)
BOSE-EINSTEIN GAS
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Condensed matter: structure, mechanical and thermal properties
ENERGY LEVELS
Exact sciences and technology
GROUND STATES
HARD-CORE POTENTIAL
MATHEMATICS
NUCLEAR POTENTIAL
NUMERICAL ANALYSIS
PHASE TRANSFORMATIONS
Physics
POTENTIALS
Quantum effects on the structure and dynamics of nondegenerate fluids (e.g., normal phase liquid 4he)
Quantum fluids and solids
liquid and solid helium
SCALING
SUPERFLUIDITY
TWO-DIMENSIONAL CALCULATIONS
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Summary:The ground-state of hard-core bosons in a random one-body potential is studied numerically to observe the transition from superfluid to insulating Bose glass'' phase. Finite-size scaling analyses are performed to estimate the transition point and critical exponents. The dynamical critical exponent is {ital z}=1.95{plus minus}0.25 and is consistent with the prediction of Fisher {ital et} {ital al}. (Phys. Rev. B 40, 546 (1989)). Values for other exponents and preliminary results regarding the universal conductivity are presented.
ISSN:0163-1829
1095-3795
DOI:10.1103/PhysRevB.45.13136