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

被引：7
|
作者：
Yamada, Naoyoshi
Sakuma, Akimasa
Tsuchiura, Hiroki
机构：
[1] Tohoku Univ, Dept Appl Phys, Aoba Ku, Sendai, Miyagi 9808579, Japan
[2] Japan Sci & Technol Corp, CREST, Kawaguchi 3320012, Japan
来源：
JOURNAL OF APPLIED PHYSICS | 2007年 / 101卷 / 09期
关键词：
D O I：
10.1063/1.2712944
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
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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页数：3
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