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Solving spin quantum master equations with matrix continued-fraction methods: application to superparamagnets

AuthorsGarcía-Palacios, J. L.; Zueco, David
Issue Date4-Oct-2006
PublisherInstitute of Physics Publishing
CitationJournal of Physics A: Mathematical and General 39: 13243-13284 (2006)
AbstractWe implement continued-fraction techniques to solve exactly quantum master equations for a spin with arbitrary S coupled to a (bosonic) thermal bath. The full spin density matrix is obtained, so that along with relaxation and thermoactivation, coherent dynamics is included (precession, tunnel, etc). The method is applied to study isotropic spins and spins in a bistable anisotropy potential (superparamagnets). We present examples of static response, the dynamical susceptibility including the contribution of different relaxation modes, and of spin resonance in transverse fields.
Description42 pages, 15 figures.
Publisher version (URL)http://dx.doi.org/10.1088/0305-4470/39/42/005
Appears in Collections:(ICMA) Artículos
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