Dynamics of a large spin with strong dissipation.
We study the generalization of the spin-boson model to spins greater than one-half in the strong-coupling regime. This model applies to dissipative large spins as well as to ensembles of identical two-state systems coupled to a common environment. Using a combination of polaron transformations and master equations, we find nonexponential spin relaxation towards one of two possible equilibrium states. For Ohmic dissipation the relaxation is approximately logarithmic in time.
Vorrath
Till
T
Universität Hamburg, I. Institut für Theoretische Physik, Germany.
Brandes
Tobias
T