Density matrix renormalisation group for a quantum spin chain at non-zero temperature
| Autor: | R. J. Bursill, Gillian A. Gehring, Tao Xiang |
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| Jazyk: | angličtina |
| Rok vydání: | 1996 |
| Předmět: |
Physics
Density matrix Band gap Group (mathematics) Density matrix renormalization group Condensed Matter (cond-mat) FOS: Physical sciences Condensed Matter Condensed Matter Physics Chain (algebraic topology) Quantum mechanics Order (group theory) General Materials Science Condensed Matter::Strongly Correlated Electrons Quantum Basis set |
| Popis: | We apply a recent adaptation of White's density matrix renormalisation group (DMRG) method to a simple quantum spin model, the dimerised $XY$ chain, in order to assess the applicabilty of the DMRG to quantum systems at non-zero temperature. We find that very reasonable results can be obtained for the thermodynamic functions down to low temperatures using a very small basis set. Low temperature results are found to be most accurate in the case when there is a substantial energy gap. 6 pages, Standard Latex File + 7 PostScript figures available on request |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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