Theory of spin-relaxation processes

V. Romero-Rochin, A. Orsky and I. Oppenheim

Physica A: Statistical Mechanics and its Applications, 1989, vol. 156, issue 1, 244-259

Abstract: The relaxation properties of a spin system weakly coupled to lattice degrees of freedom are described using an equation of motion for the spin density matrix. This equation is derived using a general weak coupling theory which has been previously developed. To second order in the weak coupling parameter, the results are in agreement with those obtained by Bloch, Wangsness and Redfield but the derivation does not make use of second order perturbation theory for short times. The derivation can be extended beyond second order and ensures that the spin density matrix relaxes to its exact equilibrium form to the appropriate order in the weak coupling parameter.

Date: 1989
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:156:y:1989:i:1:p:244-259

DOI: 10.1016/0378-4371(89)90121-0

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