Semiclassical theory of spin-orbit interaction in the extended phase space

Abstract

We consider the semiclassical theory in a joint phase space of spin and orbital degrees of freedom. The method is developed from the path integrals using the spin-coherent-state representation, and yields the trace formula for the density of states. We discuss special cases, such as weak and strong spin-orbit coupling, and relate the present theory to the earlier approaches.

36 pages, 8 figures. Version 2: revised Sec. 4.4 and Appendix B; minor corrections elsewhere

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