Detecting Majorana nonlocality using strongly coupled Majorana bound states
Detecting Majorana nonlocality using strongly coupled Majorana bound states
复制标题
使用强耦合马约拉纳束缚态检测马约拉纳非定域性
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
A. Akhmerov
中科院分区：
文献类型：
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作者：
S. Rubbert;A. Akhmerov
马约拉纳束缚态 (MBS) 与常规零能量安德烈夫束缚态的非局域性质不同，因为两个 MBS 形成单个费米子。我们通过在仍然保留可证伪性且不需要局部分离 MBS 的环境中使用库仑介导的马约拉纳耦合现象来设计检测这种非局域性的策略。重点关注基于量子自旋霍尔效应的MBS的实现，我们还设计了一种无需在螺旋边缘态中打开磁隙即可探测马约拉纳的方法。在我们分析的设置中，长程 MBS 耦合体现在隧道电导和超电流的 h/e 磁通量周期性中。虽然 h/e 也是阿哈罗诺夫-玻姆效应和持续电流的周期性，但我们展示了如何通过验证关闭充电能量恢复超导系统传统的 h/2e 周期性来确保其马约拉纳起源。
Majorana bound states (MBS) differ from the regular zero energy Andreev bound states in their nonlocal properties, since two MBS form a single fermion. We design strategies for detection of this nonlocality by using the phenomenon of Coulomb-mediated Majorana coupling in a setting which still retains falsifiability and does not require locally separated MBS. Focusing on the implementation of MBS based on the quantum spin Hall effect, we also design a way to probe Majoranas without the need to open a magnetic gap in the helical edge states. In the setup that we analyze, long range MBS coupling manifests in the h/e magnetic flux periodicity of tunneling conductance and supercurrent. While h/e is also the periodicity of Aharonov-Bohm effect and persistent current, we show how to ensure its Majorana origin by verifying that switching off the charging energy restores h/2e periodicity conventional for superconducting systems.