| Автор | Bang-Gui Liu |
| Автор | Gerd Czycholl |
| Дата выпуска | 1997-06-23 |
| dc.description | An infinite-U term is introduced into the Holstein - Primakoff-transformed magnon Hamiltonian of quantum Heisenberg magnetic models of spin s. This term removes the unphysical spin-wave states at every site, and automatically truncates the expansion in powers of the magnon occupation operator. The resultant strong-coupling magnon Hamiltonians are accurately equivalent to the original spin Hamiltonians. The on-site U-levels and their implications are studied. Within a simple decoupling approximation for our strong-coupling magnon models, we can easily reproduce the results for the (sublattice) magnetizations obtained previously for the original spin model. But our bosonic Hamiltonians without any unphysical states allow substantially improved values to be obtained for the spectral weight in the ground state, and for ground-state energies lower than those obtained within previous approximations. |
| Формат | application.pdf |
| Издатель | Institute of Physics Publishing |
| Название | An accurate mapping of quantum Heisenberg magnetic models of spin s to strong-coupling magnon systems |
| Тип | paper |
| DOI | 10.1088/0953-8984/9/25/012 |
| Electronic ISSN | 1361-648X |
| Print ISSN | 0953-8984 |
| Журнал | Journal of Physics: Condensed Matter |
| Том | 9 |
| Первая страница | 5449 |
| Последняя страница | 5459 |
| Аффилиация | Bang-Gui Liu; Institute for Theoretical Physics, Universität Bremen, D-28334 Bremen, Germany |
| Аффилиация | Gerd Czycholl; Institute for Theoretical Physics, Universität Bremen, D-28334 Bremen, Germany |
| Выпуск | 25 |
