Monte Carlo computation of the free energy in quantum two-dimensional Heisenberg ferromagnets using the expanded-ensemble method
Tatyana V. Kuznetsova, P. N. Vorontsov‐Velyaminov
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.
Journal of Physics Condensed Matter•Feb 8, 1993•11 citations