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- Title
The DSUBm approximation scheme for the coupled cluster method and applications to quantum magnets.
- Authors
Bishop, R. F.; Li, P. H. Y.; Schulenburg, J.
- Abstract
A new approximate scheme, DSUBm, is described for the coupled cluster method. We apply it to two wellstudied (spin-½ 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.
- Subjects
APPROXIMATION theory; ANTIFERROMAGNETISM; MODELS &; modelmaking; MAGNETIZATION; CRITICAL point (Thermodynamics); SPIN waves; MONTE Carlo method; QUANTUM theory; CLUSTER theory (Nuclear physics)
- Publication
Condensed Matter Physics, 2009, Vol 12, Issue 3, p479
- ISSN
1607-324X
- Publication type
Article
- DOI
10.5488/CMP.12.3.479