Spatiotemporal buildup of the Kondo screening cloud
Spatiotemporal buildup of the Kondo screening cloud
复制标题
近藤筛选云的时空构建
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
S. Kehrein
中科院分区：
文献类型：
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作者：
M. Medvedyeva;A. Hoffmann;S. Kehrein
We investigate how the Kondo screening cloud builds up as a function of space and time. Starting from an impurity spin decoupled from the conduction band, the Kondo coupling is switched on at time t=0. We work at the Toulouse point where one can obtain exact analytical results for the ensuing spin dynamics at both zero and nonzero temperature T. For t>0 the Kondo screening cloud starts building up in the wake of the impurity spin being transported to infinity. In this buildup process the impurity spin--conduction band spin susceptibility shows a sharp light cone due to causality, while the corresponding correlation function has a tail outside the light cone. At T=0 this tail has a power law decay as a function of distance from the impurity, which we interpret as due to initial entanglement in the Fermi sea.
