Anisotropy and Suppression of Spin-Orbit Interaction in a GaAs Double Quantum Dot
Anisotropy and Suppression of Spin-Orbit Interaction in a GaAs Double Quantum Dot
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DOI：
10.1103/physrevlett.119.176807
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发表时间：
2017-10-27
影响因子：
8.6
通讯作者：
Ihn, T.
中科院分区：
文献类型：
--
作者：
Hofmann, A.;Maisi, V. F.;Ihn, T.
利用时间分辨电荷探测技术测量了GaAs基双量子点的自旋翻转隧穿速率。这样的过程发生在泡利自旋封锁制度与两个电子占据双量子点。提出了调整自旋翻转隧穿率的方法，一方面可以测量Rashba和Dresselhaus的自旋轨道系数。另一方面，它们可以以高开/关比打开和关闭自旋轨道相互作用的效果。调谐是通过选择相对于晶轴的隧穿方向的对准，以及通过选择相对于自旋轨道磁场的外部磁场的取向来实现的。在接近1 kHz的隧穿速率下实现了10 s的自旋寿命。
The spin-flip tunneling rates are measured in GaAs-based double quantum dots by time-resolved charge detection. Such processes occur in the Pauli spin blockade regime with two electrons occupying the double quantum dot. Ways are presented for tuning the spin-flip tunneling rate, which on the one hand gives access to measuring the Rashba and Dresselhaus spin-orbit coefficients. On the other hand, they make it possible to turn on and off the effect of spin-orbit interaction with a high on/off ratio. The tuning is accomplished by choosing the alignment of the tunneling direction with respect to the crystallographic axes, as well as by choosing the orientation of the external magnetic field with respect to the spin-orbit magnetic field. Spin lifetimes of 10 s are achieved at a tunneling rate close to 1 kHz.