| Автор | Erik S Sørensen |
| Дата выпуска | 1998-11-30 |
| dc.description | A way of implementing the density matrix renormalization group (DMRG) method which simplifies the use of real-space parity as a conserved quantum number is discussed. The use of parity in the infinite-system DMRG calculations is often necessary in order to calculate more than the lowest excitation gap in a system. In addition, the use of parity reduces the computational overhead by a factor of two. Using parity as a symmetry we give numerical evidence that the infinite-system DMRG method in some cases displays a power-law convergence with the number of states retained. In particular we show that the often-used measure of the error in a DMRG calculation, , bears only a marginal resemblance to the true error. Spin inversion is shown to be a very useful symmetry when performing calculations in the subspace, allowing for a distinction between even and odd multiplets even when using the finite-system method. |
| Формат | application.pdf |
| Издатель | Institute of Physics Publishing |
| Название | Parity, precision and spin inversion within the density matrix renormalization group |
| Тип | paper |
| DOI | 10.1088/0953-8984/10/47/016 |
| Electronic ISSN | 1361-648X |
| Print ISSN | 0953-8984 |
| Журнал | Journal of Physics: Condensed Matter |
| Том | 10 |
| Первая страница | 10655 |
| Последняя страница | 10665 |
| Аффилиация | Erik S Sørensen; Laboratoire de Physique Quantique IRSAMC, Université Paul Sabatier, 118 Route de Narbonne, F-31062 Toulouse Cédex 4, France |
| Выпуск | 47 |
