Decoherence of localized spins interacting via RKKY interaction
Decoherence of localized spins interacting via RKKY interaction
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DOI：
10.1103/physrevb.72.033308
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发表时间：
2004-08
影响因子：
3.7
通讯作者：
Y. Rikitake;H. Imamura
中科院分区：
文献类型：
--
作者：
Y. Rikitake;H. Imamura
本文从理论上研究了一维、二维和三维电子气中两个局域自旋通过Ruderman-Kittel-Kasuya-Yosida（RKKY）相互作用的退相干。我们推导了局域自旋的约化密度矩阵的动力学方程，并表明当RKKY相互作用是铁磁的时，由单重态-三重态跃迁引起的能量弛豫被抑制。我们还估计了两个量子点嵌入二维电子气中的系统的退相干时间。
We theoretically study decoherence of two localized spins interacting via the Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction in one-, two-, and three-dimensional electron gas. We derive the kinetic equation for the reduced density matrix of the localized spins and show that energy relaxation caused by singlet-triplet transition is suppressed when the RKKY interaction is ferromagnetic. We also estimate the decoherence time of the system consisting of two quantum dots embedded in a two-dimensional electron gas.