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arXiv 0904.0167cond-mat.mes-hall
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干涉型单电子晶体管中的全电自旋控制

All-electric-spin control in interference single electron transistors

Andrea Donarini, Georg Begemann, Milena Grifoni

摘要:

单粒子干涉是量子力学的核心。我们用真空中的电子重复了典型的双缝实验,直到更大质量的$C_{60}$分子。由磁通量穿过的介观环提供了固态类似物。分子内干涉最近已在分子结中被讨论。在这里,我们提出利用干涉实现量子点中单个电子自旋的全电子控制,这是自旋电子学和自旋量子比特应用的一个非常理想的特性。该器件由干涉单电子晶体管(ISET)组成,其中轨道简并电子态之间的相消干涉在特定偏置电压下产生电流阻断。我们表明,在平行极化铁磁铅的存在下,系统上的干扰和交换耦合之间的相互作用产生了一个有效的能量重整化,产生不同的阻塞偏置的多数和少数自旋。因此,通过调节偏置电压,实现了对被捕获电子的自旋的完全控制。

英文摘要:

Single particle interference lies at the heart of quantum mechanics. The archetypal double-slit experiment has been repeated with electrons in vacuum up to the more massive $C_{60}$ molecules. Mesoscopic rings threaded by a magnetic flux provide the solid-state analogous. Intra-molecular interference has been recently discussed in molecular junctions. Here we propose to exploit interference to achieve all-electrical control of a single electron spin in quantum dots, a highly desirable property for spintronics and spin-qubit applications. The device consists of an interference single electron transistor (ISET), where destructive interference between orbitally degenerate electronic states produces current blocking at specific bias voltages. We show that in the presence of parallel polarized ferromagnetic leads the interplay between interference and the exchange coupling on the system generates an effective energy renormalization yielding different blocking biases for majority and minority spins. Hence, by tuning the bias voltage full control over the spin of the trapped electron is achieved.

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