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Successive phase transitions at finite temperatures of the supersolid in the three-dimensional extended Bose-Hubbard model
Keisuke Yamamoto, Synge Todo, Seiji Miyashita
We study the finite temperature properties of the extended Bose-Hubbard model on a cubic lattice. This model exhibits the so-called supersolid state. To start with, we investigate…
Improved chain mean-field theory for quasi-one-dimensional quantum magnets
Synge Todo, Akira Shibasaki
A novel mean-field approximation for quasi-one-dimensional (Q1D) quantum magnets is formulated. Our new mean-field approach is based on the Bethe-type effective-field theory, where…
Order-N Cluster Monte Carlo Method for Spin Systems with Long-range Interactions
Kouki Fukui, Synge Todo
An efficient O(N) cluster Monte Carlo method for Ising models with long-range interactions is presented. Our novel algorithm does not introduce any cutoff for interaction range and…
Green's function theory for spin-1/2 ferromagnets with an easy-plane exchange anisotropy
Daisuke Yamamoto, Synge Todo, Susumu Kurihara
The many-body Green's function theory with the random-phase approximation is applied to the study of easy-plane spin-1/2 ferromagnets in an in-plane magnetic field. We demonstrate…