论文标题
双量子点中的纠缠旋转和伪赋的进度
Precession of entangled spin and pseudospin in double quantum dots
论文作者
论文摘要
量子点旋转阀的特征是交换场，即使没有自旋分裂，也会引起自旋进动并产生电流自旋共振。已经在双量子点中研究了类似效应，其中轨道自由度（伪传）取代了阀构型中的自旋。现在，我们概括了这种设置，以允许铅的任意自旋和轨道极化，从而获得了纠缠旋转和伪传的进动动态的各种当前共振。我们观察两个矢量的纯净，泵送和进取的微妙相互作用，只能通过考虑自旋 - 质量溶剂相关剂的动力学来理解。数值结果是在共同渠道近似中的广义主方程的框架中获得的，并由连贯的顺序隧穿模型的分析补充。
Quantum dot spin valves are characterized by exchange fields which induce spin precession and generate current spin resonances even in absence of spin splitting. Analogous effects have been studied in double quantum dots, in which the orbital degree of freedom, the pseudospin, replaces the spin in the valve configuration. We generalize, now, this setup to allow for arbitrary spin and orbital polarization of the leads, thus obtaining an even richer variety of current resonances, stemming from the precession dynamics of entangled spin and pseudospin. We observe for both vectors a delicate interplay of decoherence, pumping and precession which can only be understood by also considering the dynamics of the spin-pseudospin correlators. The numerical results are obtained in the framework of a generalized master equation within the cotunneling approximation and are complemented by the analytics of a coherent sequential tunneling model.
