Proposal for the detection and braiding of Majorana fermions in a quantum spin Hall insulator

Article

关键词: TOPOLOGICAL INSULATORS;    MATRIX THEORY;    TRANSPORT;    WELLS;    STATE;   

DOI  :  10.1103/PhysRevB.87.241405

来源: SCIE

【 摘 要 】

We show how a quantum dot with a ballistic single-channel point contact to a superconductor can be created by means of a gate electrode at the edge of a quantum spin Hall insulator (such as an InAs/GaSb quantum well). A weak perpendicular magnetic field traps a Majorana zero mode, so that it can be observed in the gate-voltage-averaged differential conductance < dI/dV > as a 4e(2)/h zero-bias peak above a (2/3 pi(2) - 4)e(2)/h background. The one-dimensional edge does not permit the braiding of pairs of Majorana fermions, but this obstacle can be overcome by coupling opposite edges at a constriction, allowing for a demonstration of non-Abelian statistics.

【 授权许可】

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