论文标题

连贯的电子光学元件与弹性耦合量子点触点

Coherent Electron Optics with Ballistically Coupled Quantum Point Contacts

论文作者

Freudenfeld, Jaan, Geier, Max, Umansky, Vladimir, Brouwer, Piet W., Ludwig, Stefan

论文摘要

综合量子电路的实现需要精确的芯片控制电荷载体。针对零磁场处遥远的纳米结构的相干耦合,在这里我们以三个末端配置以串联的两个量子点触点(QPC)研究弹道电子传输。我们通过使用场效应镜头通过静电聚焦来增强QPC之间的耦合。为了详细研究QPC的发射和收集特性,我们将静电聚焦与磁偏转结合在一起。将我们的测量结果与量子机械和经典计算进行比较,我们证明了相干和弹道动力学如何取决于QPC限制电位的细节。

The realization of integrated quantum circuits requires precise on-chip control of charge carriers. Aiming at the coherent coupling of distant nanostructures at zero magnetic field, here we study the ballistic electron transport through two quantum point contacts (QPCs) in series in a three terminal configuration. We enhance the coupling between the QPCs by electrostatic focusing using a field effect lens. To study the emission and collection properties of QPCs in detail we combine the electrostatic focusing with magnetic deflection. Comparing our measurements with quantum mechanical and classical calculations we demonstrate how the coherent and ballistic dynamics depend on the details of the QPC confinement potentials.

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