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arXiv 1004.4702cond-mat.str-elcond-mat.supr-con
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用Majorana费米子干涉术探测自旋轨道耦合半导体中的非阿贝尔统计

Probing non-Abelian statistics with Majorana fermion interferometry in spin-orbit-coupled semiconductors

Jay D. Sau, Sumanta Tewari, S. Das Sarma

摘要:

具有非阿贝尔统计的量子力学系统的列表最近已经通过包括通用的自旋轨道耦合半导体而扩展,例如,InAs)接近s波超导体。在这个系统中使用马约拉纳费米子干涉术证明任意子统计是走向拓扑量子计算(TQC)的必要的第一步。然而,由于在半导体中可以产生的所有孤立的手性边缘都是电荷中性的,因此不清楚在该系统中是否可以进行电控干涉。在这里,我们表明,当两个孤立的手性马约拉纳边缘被带到紧密接触,所得的界面支持电荷电流,使电控马约拉纳费米子干涉在半导体结构。半导体上的这种干涉测量实验类似于$ν=5/2$分数量子霍尔系统上和3D强拓扑绝缘体表面上的类似干涉测量实验,说明了2D半导体异质结构作为合适的TQC平台的有用性。特别是,我们提出的Majorana干涉仪可能是最直接的方法建立非阿贝尔编织统计的拓扑超导体。

英文摘要:

The list of quantum mechanical systems with non-Abelian statistics has recently been expanded by including generic spin-orbit-coupled semiconductors e.g., InAs) in proximity to a s-wave superconductor. Demonstration of the anyonic statistics using Majorana fermion interferometry in this system is a necessary first step towards topological quantum computation (TQC). However, since all isolated chiral edges that can be created in the semiconductor are charge neutral, it is not clear if electrically controlled interferometry is possible in this system. Here we show that when two isolated chiral Majorana edges are brought into close contact, the resultant interface supports charge current, enabling electrically controlled Majorana fermion interferometry in the semiconductor structure. Such interferometry experiments on the semiconductor are analogous to similar interferometry experiments on the $ν=5/2$ fractional quantum Hall systems and on the surface of a 3D strong topological insulator, illustrating the usefulness of the 2D semiconductor heterostructure as a suitable TQC platform. In particular, we proposed Majorana interferometers may be the most direct method for establishing non-Abelian braiding statistics in topological superconductors.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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