Quantum Critical Point of the XY Model and Condensation of Field-induced Quasiparticles in Dimer Compounds

  • Kawashima Naoki
    Department of Physics, Tokyo Metropolitan University Institute for Solid State Physics, University of Tokyo

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  • Quantum Critical Point of the<i>X</i><i>Y</i>Model and Condensation of Field-induced Quasiparticles in Dimer Compounds

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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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