Exchange cotunneling through quantum dots with spin-orbit coupling
Exchange cotunneling through quantum dots with spin-orbit coupling
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通过自旋轨道耦合的量子点交换共隧道
DOI：
10.1103/physrevb.82.081309
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发表时间：
2010
影响因子：
3.7
通讯作者：
K. Flensberg
中科院分区：
文献类型：
--
作者：
J. Paaske;A. Andersen;K. Flensberg
研究了自旋轨道相互作用（SOI）对自旋库仑阻塞量子点交换共隧穿的影响。在磁场为零的情况下，近藤效应是通过Kramers偶极子发生的，SOI只影响近藤温度。相反，我们发现有限场中时间反演对称性的破缺对单能级有效安德森模型和近藤模型有显著的影响。非线性电导现在可以在偏置电压中是不对称的，并且可以强烈地依赖于磁场的方向。有限场共隧穿光谱的角度依赖性的测量，从而提供了有价值的信息轨道和自旋自由度和它们的相互耦合。
We investigate the effects of spin-orbit interaction (SOI) on the exchange cotunneling through a spinful Coulomb blockaded quantum dot. In the case of zero magnetic field, Kondo effect is shown to take place via a Kramers doublet and the SOI will merely affect the Kondo temperature. In contrast, we find that the breaking of time-reversal symmetry in a finite field has a marked influence on the effective Anderson and Kondo models for a single level. The nonlinear conductance can now be asymmetric in bias voltage and may depend strongly on the direction of the magnetic field. A measurement of the angle dependence of finite-field cotunneling spectroscopy thus provides valuable information about orbital and spin degrees of freedom and their mutual coupling.