Journal
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
Volume 73, Issue 12, Pages 3219-3222Publisher
PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJ.73.3219
Keywords
quantum spin system; Heisenberg model; quantum Monte Carlo; XY model; XXZ model; cluster algorithm; loop algorithm; worm algorithm; directed-loop algorithm
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The quantum critical point of the three-dimensional XY model in a symmetry-preserving field is investigated. The results of Monte Carlo simulations with the directed-loop algorithm show that the quantum critical behavior is characterized by the mean-field values of critical exponents. The system-size dependence of various quantities is compared to a simple field-theoretical argument that supports the mean-field scaling.
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