Decoherence processes of a quantum two-level system coupled to a fermionic environment
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...
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Veröffentlicht in: | Journal of applied physics 2007-05, Vol.101 (9) |
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Hauptverfasser: | , , |
Format: | Artikel |
Sprache: | eng |
Online-Zugang: | Volltext |
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Zusammenfassung: | 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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ISSN: | 0021-8979 1089-7550 |
DOI: | 10.1063/1.2712944 |