双量子点自旋注入的探测：核极化不稳定性的磁场反转对称性破坏
Detection of spin injection into a double quantum dot: Violation of magnetic-field-inversion symmetry of nuclear polarization instabilities
摘要：
在具有自旋轨道耦合的介观系统中，零磁场下的自旋注入量子点具有广泛的应用前景。然而，到目前为止，一个可行的方法来实验确定这种注射一直缺乏。我们发现，电子自旋注入到自旋阻塞的双量子点中，会显著地破坏核极化不稳定性的磁场反转对称性。在很宽的参数范围内，正负不稳定场之间的不对称性对注入的电子自旋极化非常敏感，并且允许检测甚至非常弱的自旋注入。这种现象可以用来研究自旋输运的机制，并可能对基于自旋的信息处理产生影响。
英文摘要：
In mesoscopic systems with spin-orbit coupling, spin-injection into quantum dots at zero magnetic field is expected under a wide range of conditions. However, up to now, a viable approach for experimentally identifying such injection has been lacking. We show that electron spin injection into a spin-blockaded double quantum dot is dramatically manifested in the breaking of magnetic- field-inversion symmetry of nuclear polarization instabilities. Over a wide range of parameters, the asymmetry between positive and negative instability fields is extremely sensitive to the injected electron spin polarization and allows for the detection of even very weak spin injection. This phenomenon may be used to investigate the mechanisms of spin transport, and may hold implications for spin-based information processing.
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