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4 papers · 1 filter
Dynamics of the Density Matrix in Contact with a Thermal Bath and the Quantum Master Equation
Takashi Mori, Seiji Miyashita
We study the structure of the time evolution of the density matrix in contact with a thermal bath in a standard projection operator sheme. The reduced density matrix of the system…
Mechanism of Slow Relaxation due to Screening Effect in a Frustrated System
Shu Tanaka, Seiji Miyashita
We study a slow relaxation process in a frustrated spin system in which a type of screening effect due to a frustrated environment plays an important role. This screening effect is…
Slow Relaxation of Spin Structure in Exotic Ferromagnetic Phase of Ising-like Heisenberg Kagome Antiferromagnets
Shu Tanaka, Seiji Miyashita
In the corner-sharing lattice, magnetic frustration causes macroscopic degeneracy in the ground state, which prevents systems from ordering. However, if the ensemble of the degener…
Non-monotonic Relaxation in Systems with Reentrant Type Interaction
Seiji Miyashita, Shu Tanaka, Masaki Hirano
Recently, interesting non-monotonic time evolution has been pointed out in the experiments by Jönsson, {\it et al.} and Jonsson {\it et.al.} and also in the numerical simulation by…