论文标题
由Andreev结合状态介导的受控的越过Andreev反射和弹性弯曲
Controlled crossed Andreev reflection and elastic co-tunneling mediated by Andreev bound states
论文作者
论文摘要
一个简短的超导段可以通过弹性隧道（ECT）和Andreev反射（CAR）将附着的量子点（CAR）结合在一起。只要可以控制汽车与ECT之间的比率，这种耦合的量子点可以容纳主要结合状态。到目前为止，金属超导体已显示出可调性有限的隧道现象。在这里，我们表明，在半导体 - 螺旋体异质结构中形成的Andreev结合状态可以介导汽车和ECT在中学长度尺度上。 Andreev结合的状态具有电子和孔成分，产生了复杂的干扰现象，使我们能够按确定性地调整CAR和ECT之间的比率。我们进一步表明，INSB纳米线中固有的自旋轨道耦合和施加的磁场的组合提供了另一个有效的旋钮，以调整ECT和CAR之间的比率，并优化相邻量子点之间的耦合量。
A short superconducting segment can couple attached quantum dots via elastic co-tunneling (ECT) and crossed Andreev reflection (CAR). Such coupled quantum dots can host Majorana bound states provided that the ratio between CAR and ECT can be controlled. Metallic superconductors have so far been shown to mediate such tunneling phenomena, albeit with limited tunability. Here we show that Andreev bound states formed in semiconductor-superconductor heterostructures can mediate CAR and ECT over mesoscopic length scales. Andreev bound states possess both an electron and a hole component, giving rise to an intricate interference phenomenon that allows us to tune the ratio between CAR and ECT deterministically. We further show that the combination of intrinsic spin-orbit coupling in InSb nanowires and an applied magnetic field provides another efficient knob to tune the ratio between ECT and CAR and optimize the amount of coupling between neighboring quantum dots.
