| Автор | Christian Knetter |
| Автор | Erwin Müller-Hartmann |
| Автор | Götz S Uhrig |
| Автор | Erwin Müller-Hartmann |
| Дата выпуска | 2000-10-23 |
| dc.description | We investigate the one-triplet dispersion in a modified Shastry-Sutherland model for SrCu<sub>2</sub>(BO<sub>3</sub>)<sub>2</sub> by means of a series expansion about the limit of strong dimerization. Our perturbative method is based on a continuous unitary transformation that maps the original Hamiltonian to an effective, energy-quanta-conserving block diagonal Hamiltonian H<sub>eff</sub>. The dispersion splits into two branches which are nearly degenerate. We analyse the symmetries of the model and show that space group operations are necessary to explain the degeneracy of the dispersion at k = 0 and at the border of the magnetic Brillouin zone. Moreover, we investigate the behaviour of the dispersion for small |k| and compare our results to inelastic neutron scattering data. |
| Формат | application.pdf |
| Издатель | Institute of Physics Publishing |
| Название | Symmetries and triplet dispersion in a modified Shastry-Sutherland model for SrCu<sub>2</sub>(BO<sub>3</sub>)<sub>2</sub> |
| Тип | paper |
| DOI | 10.1088/0953-8984/12/42/312 |
| Electronic ISSN | 1361-648X |
| Print ISSN | 0953-8984 |
| Журнал | Journal of Physics: Condensed Matter |
| Том | 12 |
| Первая страница | 9069 |
| Последняя страница | 9083 |
| Аффилиация | Christian Knetter; Institut für Theoretische Physik, Universität zu Köln, Zülpicher Strasse 77, D-50937 Köln, Germany |
| Аффилиация | Erwin Müller-Hartmann; Institut für Theoretische Physik, Universität zu Köln, Zülpicher Strasse 77, D-50937 Köln, Germany |
| Аффилиация | Götz S Uhrig; Institut für Theoretische Physik, Universität zu Köln, Zülpicher Strasse 77, D-50937 Köln, Germany |
| Аффилиация | Erwin Müller-Hartmann; Institut für Theoretische Physik, Universität zu Köln, Zülpicher Strasse 77, D-50937 Köln, Germany |
| Выпуск | 42 |
