1.
Phys Rev Lett
; 95(7): 070402, 2005 Aug 12.
Artigo
em Inglês
| MEDLINE
| ID: mdl-16196766
RESUMO
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.