Current cross-correlation in the Anderson impurity model with exchange interaction
Current cross-correlation in the Anderson impurity model with exchange interaction
复制标题
安德森杂质模型中具有交换相互作用的当前互相关
DOI：
10.1103/physrevb.97.045127
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发表时间：
2018
影响因子：
3.7
通讯作者：
Abe Eisuke
中科院分区：
文献类型：
--
作者：
Sakano Rui;Oguri Akira;Nishikawa Yunori;Abe Eisuke
本文研究了局域费米液体准粒子在非线性电流中通过Anderson杂质模型描述的两个简并轨道通过交换相互作用耦合在一起的量子点的自旋纠缠。应用重归一化微扰理论，我们得到了自旋角为任意方向的电流的累积量生成函数的精确形式和在施加偏置电压下高达三阶的相互关系。研究发现，交换相互作用使通过两个不同轨道的电流相互关中产生自旋角依赖，并使具有三个不同角动量的电流相互关中产生本征互相关。
We study spin entanglement of the quasiparticles of the local Fermi liquid excited in nonlinear current through a quantum dot described by the Anderson impurity model with two degenerate orbitals coupled to each other via an exchange interaction. Applying the renormalized perturbation theory, we obtain the precise form of the cumulant generating function and cross-correlations for the currents with spin angled to arbitrary directions, up to third order in the applied bias voltage. It is found that the exchange interaction gives rise to spin-angle dependency in the cross-correlation between the currents through the two different orbitals and also brings an intrinsic cross-correlation of currents with three different angular momenta.