Decoherence processes of a quantum two-level system coupled to a fermionic environment

Details Decoherence processes of a quantum two-level system coupled to a fermionic environment Decoherence processes of a quantum two-level system coupled to a fermionic environment

2007-02-13

arxiv.org/abs/cond-mat/0702296v1

JOURNAL OF APPLIED PHYSICS 101, 09C110 (2007)

Physics

Condensed Matter

Materials Science

to appear in J. Appl. Phys

Scientific paper

10.1063/1.2712944

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.

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