Monte Carlo computation of the free energy in quantum two-dimensional Heisenberg ferromagnets using the expanded-ensemble method
T V Kuznetsova; P N Vorontsov-Velyaminov; T V Kuznetsova; Sci. Res. Inst. of Phys., St. Petersburg Univ., Russia; P N Vorontsov-Velyaminov; Sci. Res. Inst. of Phys., St. Petersburg Univ., Russia
Журнал:
Journal of Physics: Condensed Matter
Дата:
1993-02-08
Аннотация:
The expanded-ensemble method, initially formulated for classical systems, is combined with the Handscomb quantum Monte Carlo approach to develop a new method for the free-energy MC calculation of quantum systems. It was applied to a quantum 2D Heisenberg ferromagnetic system and proved effective. Comparisons were performed between the Takahashi spin-wave approximation for free energy and the authors' numerical results.
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