| Автор | Jukka A Ketoja |
| Автор | Indubala I Satija |
| Дата выпуска | 1997-02-03 |
| dc.description | We study the phase diagram of the tight-binding model for an electron on an anisotropic square lattice with a four-dimensional parameter space defined by two nearest-neighbour and two next-nearest-neighbour couplings. Using a renormalization scheme, we show that the inequality of the two next-nearest-neighbour couplings destroys the fat critical regime found in the isotropic case above the bicritical line and replaces it with another re-entrant extended phase. The scaling properties of the model are those of the corresponding tight-binding models on the nearest-neighbour square and triangular lattices. The triangular universality class also describes the quantum Ising chain in a transverse field with the only exception being the conformally invariant state of the Ising model which has no analogue in the triangular-lattice case. |
| Формат | application.pdf |
| Издатель | Institute of Physics Publishing |
| Название | The re-entrant phase diagram of the generalized Harper equation |
| Тип | paper |
| DOI | 10.1088/0953-8984/9/5/016 |
| Electronic ISSN | 1361-648X |
| Print ISSN | 0953-8984 |
| Журнал | Journal of Physics: Condensed Matter |
| Том | 9 |
| Первая страница | 1123 |
| Последняя страница | 1132 |
| Выпуск | 5 |
