Chiral Majorana fermion modes regulated by a scanning tunneling microscope tip

Chiral Majorana fermion modes regulated by a scanning tunneling microscope tip
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由扫描隧道显微镜尖端调节的手性马约拉纳费米子模式

DOI:
10.1103/physrevb.97.115452
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发表时间:
2017-11
期刊:
影响因子:
3.7
通讯作者:
Qing-Feng Sun
Qing-Feng Sun
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Yan-Feng Zhou;Zhe Hou;Ying-Tao Zhang;Qing-Feng Sun

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控制马约拉纳费米子是实现拓扑量子计算的一个重要步骤。马约拉纳费米子可以用一个只有两个相位(0和{\pi})的真实的波函数来描述,这提供了一个可控的自由度。我们提出了一种策略来调节相位的手性马约拉纳状态耦合与扫描隧道显微镜的尖端在一个系统中组成的量子反常霍尔绝缘体与超导体耦合。随着化学势的变化,手征Majorana态可以在0和{\pi}之间交替调谐,相应地出现了完美的正向隧穿和完美的交叉Andreev反射。完美的交叉Andreev反射,其中一个库珀对可以被分裂成两个电子进入不同的终端完全,导致泵浦电流和不同的量子化电阻。这些研究结果可能为马约拉纳州的相位调控提供一条可行的途径。
The control of Majorana fermions is an essential procedure for implementing topological quantum computation. The Majorana fermion can be described by a real wave function with only two phases (0 and {\pi}) which provide a controllable degree of freedom. We propose a strategy to regulate the phase of the chiral Majorana state by coupling with a scanning tunneling microscope tip in a system consisting of quantum anomalous Hall insulator coupled with a superconductor. With the change of the chemical potential, the chiral Majorana state can be tuned alternately between 0 and {\pi}, in which, correspondingly, the perfect normal tunneling and perfect crossed Andreev reflection appear. The perfect crossed Andreev reflection, by which a Cooper pair can be split into two electrons going into different terminals completely, leads to a pumping current and distinct quantized resistances. These findings may give a feasible avenue to regulate the phase of Majorana state.
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