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7 papers · 1 filter
Quantum response to time-dependent external fields
Seiji Miyashita, Shu Tanaka, Hans De Raedt +1
Recently, explicit real time dynamics has been studied in various systems. These quantum mechanical dynamics could provide new recipes in information processing. We study quantum d…
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…
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…
Slow Relaxation Process in Ising like Heisenberg Kagome Antiferromagnets due to Macroscopic Degeneracy in the Ordered State
Shu Tanaka, Seiji Miyashita
We study relaxation phenomena in the ferromagnetically ordered state of the Ising-like Heisenberg kagome antiferromagnets. We introduce the "weathervane loop" in order to character…
Universal Reduction of Effective Coordination Number in the Quasi-One-Dimensional Ising Model
Synge Todo
Critical temperature of quasi-one-dimensional general-spin Ising ferromagnets is investigated by means of the cluster Monte Carlo method performed on infinite-length strips, L time…
Theory of Non-Equilibirum States Driven by Constant Electromagnetic Fields: Non-Commutative Quantum Mechanics in the Keldysh Formalism
Shigeki Onoda, Naoyuki Sugimoto, Naoto Nagaosa
We develop a general theory of non-equilibrium states based on the Keldysh formalism, in particular, for charged-particle systems under static uniform electromagnetic fields. The D…