| Автор | Kazutaka Takahashi |
| Автор | Yoshiki Matsuda |
| Дата выпуска | 2010-06-01 |
| dc.description | We study for random quantum spin systems the energy gap between the ground and first excited states to clarify a relation to the spin-glass-paramagnetic phase transition. We find that for the transverse Sherrington-Kirkpatrick model the vanishing of the averaged gap does not identify the transition. A power-law form of the gap distribution function leads to power-law distributions of the linear, spin-glass, and nonlinear susceptibilities. They diverge at different points, which we attribute to a quantum "Griffiths" mechanism. On the other hand, the classical treatment is justified for the transverse random energy model and the phase transition can be found by a sudden change of the ground state. |
| Формат | application.pdf |
| Издатель | Institute of Physics Publishing |
| Копирайт | © 2010 IOP Publishing Ltd |
| Название | Energy-gap analysis of quantum spin-glass transitions at zero temperature |
| Тип | paper |
| DOI | 10.1088/1742-6596/233/1/012008 |
| Electronic ISSN | 1742-6596 |
| Print ISSN | 1742-6588 |
| Журнал | Journal of Physics: Conference Series |
| Том | 233 |
| Первая страница | 12008 |
| Последняя страница | 12017 |
| Аффилиация | Kazutaka Takahashi; Department of Physics, Tokyo Institute of Technology, Tokyo 152-8551, Japan |
| Аффилиация | Yoshiki Matsuda; Department of Physics, Tokyo Institute of Technology, Tokyo 152-8551, Japan |
| Выпуск | 1 |
