Class D Spectral Peak in Majorana Quantum Wires
Class D Spectral Peak in Majorana Quantum Wires
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DOI：
10.1103/physrevlett.109.227005
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发表时间：
2012-11-29
影响因子：
8.6
通讯作者：
Altland, Alexander
中科院分区：
文献类型：
--
作者：
Bagrets, Dmitry;Altland, Alexander
邻近耦合自旋轨道量子线据称在临界点支持中隙马约拉纳态。我们发现，在存在的障碍，这些系统产生第二个带中心异常，这是不同的物理起源，但共享的主要特征与马约拉纳状态：它是窄的宽度，不敏感的磁场，进行单位光谱重量，并严格绑定到带中心。根据子带隙准粒子态的奇偶性，马约拉纳模式与杂质峰共存或不共存。这两种现象之间的强烈“纠缠”可能会阻碍通过光谱技术对马约拉纳的明确检测。
Proximity coupled spin-orbit quantum wires purportedly support midgap Majorana states at critical points. We show that, in the presence of disorder, these systems generate a second band center anomaly, which is of different physical origin but shares key characteristics with the Majorana state: it is narrow in width, insensitive to magnetic fields, carries unit spectral weight, and is rigidly tied to the band center. Depending on the parity of the number of subgap quasiparticle states, a Majorana mode does or does not coexist with the impurity peak. The strong "entanglement'' between the two phenomena may hinder an unambiguous detection of the Majorana by spectroscopic techniques.