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Semiclassical description of Heisenberg models via spin-coherent states | John Schliemann
; Franz G. Mertens
; | Date: |
13 Oct 1998 | Journal: | J. Phys.: Condens. Matter 10, 1091 (1998) | Subject: | Condensed Matter; Pattern Formation and Solitons | cond-mat nlin.PS patt-sol quant-ph | Abstract: | We use spin-coherent states as a time-dependent variational ansatz for a semiclassical description of a large family of Heisenberg models. In addition to common approaches we also evaluate the square variance of the Hamiltonian in terms of coherent states. This quantity turns out to have a natural interpretation with respect to time-dependent solutions of the equations of motion and allows for an estimate of quantum fluctuations in a semiclassical regime. The general results are applied to solitons, instantons and vortices in several one- and two-dimensional models. | Source: | arXiv, cond-mat/9810145 | Services: | Forum | Review | PDF | Favorites |
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