The DSUBm approximation scheme for the coupled cluster method and applications to quantum magnets
A new approximate scheme, DSUBm, is described for the coupled cluster method. We apply it to two wellstudied (spin-1/2 Heisenberg antiferromagnet) spin-lattice models, namely: the XXZ and the XY models on the square lattice in two dimensions. Results are obtained in each case for the ground-state...
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| Date: | 2009 |
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| Main Authors: | , , |
| Format: | Article |
| Language: | English |
| Published: |
Інститут фізики конденсованих систем НАН України
2009
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| Series: | Condensed Matter Physics |
| Online Access: | http://dspace.nbuv.gov.ua/handle/123456789/120023 |
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| Journal Title: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Cite this: | The DSUBm approximation scheme for the coupled cluster method and applications to quantum magnets / R.F. Bishop, P.H.Y. Li, J. Schulenburg // Condensed Matter Physics. — 2009. — Т. 12, № 3. — С. 479-496. — Бібліогр.: 43 назв. — англ. |
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Digital Library of Periodicals of National Academy of Sciences of Ukraine| Summary: | A new approximate scheme, DSUBm, is described for the coupled cluster method. We apply it to two wellstudied
(spin-1/2 Heisenberg antiferromagnet) spin-lattice models, namely: the XXZ and the XY models
on the square lattice in two dimensions. Results are obtained in each case for the ground-state energy, the
sublattice magnetization and the quantum critical point. They are in good agreement with those from such alternative
methods as spin-wave theory, series expansions, exact diagonalization techniques, quantum Monte
Carlo methods and those from the CCM using the LSUBm scheme. |
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