摘要翻译：
我们系统地研究了局域电子在任意核自旋浴中的普遍自旋退相干动力学，由于弱的核-晶格相互作用，局域电子甚至可以远离平衡。我们表明，只要初始态由足够多的自旋本征态组成，电子自旋弛豫动力学（以及自旋纯退相和Hahn回波衰变）就可以{总是}具有普适性。对于一个给定的系统，宇宙动力学的模式只依赖于复杂的初始条件，它通过一个{It单}参数来度量初始状态下不同自旋本征态之间的相位相干量。我们的结果即使在所涉及的原子核数目不多的情况下也适用，因此为理论/数值结果与实验测量的比较提供了坚实的基础。作为一个例子，我们也给出了零磁场下非相互作用自旋浴系统的数值结果，并讨论了泛退相干动力学的特征。
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英文标题：
《Universal dynamics of quantum spin decoherence in a spin bath》
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作者：
Yi-Ya Tian, Pochung Chen and Daw-Wei Wang
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最新提交年份：
2008
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分类信息：

一级分类：Physics        物理学
二级分类：Mesoscale and Nanoscale Physics        介观和纳米物理
分类描述：Semiconducting nanostructures: quantum dots, wires, and wells. Single electronics, spintronics, 2d electron gases, quantum Hall effect, nanotubes, graphene, plasmonic nanostructures
半导体纳米结构：量子点、线和阱。单电子学，自旋电子学，二维电子气，量子霍尔效应，纳米管，石墨烯，等离子纳米结构
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一级分类：Physics        物理学
二级分类：Statistical Mechanics        统计力学
分类描述：Phase transitions, thermodynamics, field theory, non-equilibrium phenomena, renormalization group and scaling, integrable models, turbulence
相变，热力学，场论，非平衡现象，重整化群和标度，可积模型，湍流
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英文摘要：
  We systematically investigate the universal spin decoherence dynamics of a localized electron in an arbitrary nuclear spin bath, which can be even far away from equilibrium due to the weak nuclear-lattice interaction. We show that the electron spin relaxation dynamics (as well as spin pure dephasing and Hahn echo decay) can {\it always} have a universal behavior as long as the initial state is composed of a sufficiently large amount of spin eigenstates. For a given system, the pattern of the universal dynamics depends on the complicated initial condition only via a {\it single} parameter, which measures the amount of phase coherence between different spin eigenstates in the initial state. Our results apply even when the number of the involved nuclei is not large, and therefore provide a solid foundation in the comparison of theoretical/numerical results with the experimental measurement. As an example, we also show numerical results for systems of noninteracting spin bath in zero magnetic field regime, and discuss the features of universal decoherent dynamics.
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PDF链接：
https://arxiv.org/pdf/707.1131