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Transport anomaly in the low energy regime of spin chains
Keiji Saito
The anomalous thermal conductivity in spin chains observed in experiments is studied for the low temperature regime. In the effective dynamics with most realistic perturbations, th…
Strong Evidence of Normal Heat Conduction in a one-Dimensional Quantum System
Keiji Saito
We investigate how the normal energy transport is realized in one-dimensional quantum systems using a quantum spin system. The direct investigation of local energy distribution und…
Form Factor of a Quantum Graph in a Weak Magnetic Field
Taro Nagao, Keiji Saito
Using periodic orbit theory, we evaluate the form factor of a quantum graph to which a very weak magnetic field is applied. The first correction to the diagonal approximation descr…
Frequency Dependence of Quantum Localization in a Periodically Driven System
Manabu Machida, Keiji Saito, Seiji Miyashita
We study the quantum localization phenomena for a random matrix model belonging to the Gaussian orthogonal ensemble (GOE). An oscillating external field is applied on the system. A…
Enhancement of the Thermal Conductivity in gapped Quantum Spin Chains
Keiji Saito, Seiji Miyashita
We study mechanism of magnetic energy transport, motivated by recent measurements of the thermal conductivity in low dimensional quantum magnets. We point out a possible mechanism…