Fingerprints of Majorana Bound States in Aharonov-Bohm Geometry.
Fingerprints of Majorana Bound States in Aharonov-Bohm Geometry.
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DOI：
10.1103/physrevlett.116.166401
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发表时间：
2015-09
影响因子：
8.6
通讯作者：
K. M. Tripathi;Sourin Das;Sumathi Rao
中科院分区：
文献类型：
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作者：
K. M. Tripathi;Sourin Das;Sumathi Rao
我们研究了一个环的几何形状，耦合到两个正常的金属引线，其中有一个马约拉纳束缚态（MBS）嵌入在它的一个手臂，并通过Aharonov-Bohm（AB）通量线。我们发现，通过改变AB通量，两个引线以一种与量子力学相关的方式发生共振，而共振电导被量子化为2 e ^{2}/h。我们进一步表明，这种关系是完全不存在的MBS时，由Andreev束缚态（ABS）取代。因此，当研究电导的这种反相关性时，其作为ABS的函数提供了MBS的唯一签名，其不能被ABS伪造。我们对比的MBS和ABS的隧穿电导的相位灵敏度。我们认为，电子和空穴的隧穿幅度之间的相对相位从任一导致水平（MBS或ABS），这是限制为0，π的MBS和ABS的不受约束，是负责在MBS和ABS之间的AB效应的这种有趣的对比。
We study a ring geometry, coupled to two normal metallic leads, which has a Majorana bound state (MBS) embedded in one of its arms and is threaded by Aharonov-Bohm (AB) flux ϕ. We show that by varying the AB flux, the two leads go through resonance in an anticorrelated fashion while the resonance conductance is quantized to 2e^{2}/h. We further show that such anticorrelation is completely absent when the MBS is replaced by an Andreev bound state (ABS). Hence this anti-correlation in conductance when studied as a function of ϕ provides a unique signature of the MBS which cannot be faked by an ABS. We contrast the phase sensitivity of the MBS and ABS in terms of tunneling conductances. We argue that the relative phase between the tunneling amplitude of the electrons and holes from either lead to the level (MBS or ABS), which is constrained to 0,π for the MBS and unconstrained for the ABS, is responsible for this interesting contrast in the AB effect between the MBS and ABS.