Decoherence processes of a quantum two-level system coupled to a fermionic environment
arXiv:cond-mat/0702296 · doi:10.1063/1.2712944
Abstract
We study decoherence processes of an S = 1/2 localized spin coupled to conduction band electrons in a metal or a semiconductor via an Ising-like interaction. We derive master equations for the density matrix of the localized spin, by tracing out all degrees of freedom in the conduction electron system based on the linked-cluster-expansion technique. It is found that the decoherence occurs more rapidly for the metallic case than for semiconducting case.
to appear in J. Appl. Phys