Long time evolution of a spin interacting with a spin bath in arbitrary magnetic field

查看全文 作　　者：ZHAO [1]YuKang;ZHAO [2]MeiSheng;CHEN [1]ZengBing

机构地区：[1]Hefei National Laboratory for Physical Science at Microscale and Department of Modern Physics, University of Science and Technology of China;[2]Shandong Institute of Quantum Science & Technology Co., Ltd.

出　　处：《Science China(Physics,Mechanics & Astronomy)》索引2014年第57卷第7期,共4页

基　　金：supported by the National Basic Research Program of China(Grant Nos.2011CBA00300 and 2011CBA00301);the National Natural Science Foundation of China(Grant No.61033001);the Chinese Academy of Science 摘　　要：We introduce a completely different method to calculate the evolution of a spin interacting with a sufficient large spin bath,especially suitable for treating the central spin model in a quantum dot(QD).With only an approximation on the envelope of central spin,the symmetry can be exploited to reduce a huge Hilbert space which cannot be calculated with computers to many small ones which can be solved exactly.This method can be used to calculate spin-bath evolution for a spin bath containing many(say,1000)spins,without a perturbative limit such as strong magnetic field condition,and works for long-time regime with sufficient accuracy.As the spin-bath evolution can be calculated for a wide range of time and magnetic field,an optimal dynamic of spin flip-flop can be found,and more sophisticated approaches to achieve extremely high polarization of nuclear spins in a QD could be developed. 关键词：自旋相互作用旋转模型强磁场时间演变 HILBERT空间洗澡计算机

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Long time evolution of a spin interacting with a spin bath in arbitrary magnetic field

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