J. Bolte, R. Glaser and S. Keppeler
Quantum and classical ergodicity of spinning particles
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ABSTRACT.  We give a formulation of quantum ergodicity for Pauli Hamiltonians with 
arbitrary spin in terms of a Wigner-Weyl calculus. The corresponding 
classical phase space is the direct product of the phase space of the 
translational degrees of freedom and the two-sphere. On this product space 
we introduce a combination of the translational motion and classical spin 
precession. We prove quantum ergodicity under the condition that this 
product flow is ergodic.