Theory of tunneling conductance and surface-state transition in superconducting topological insulators
Theory of tunneling conductance and surface-state transition in superconducting topological insulators
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DOI：
10.1103/physrevb.85.180509
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发表时间：
2011-12
影响因子：
3.7
通讯作者：
A. Yamakage;K. Yada;M. Sato;Yukio Tanaka
中科院分区：
文献类型：
--
作者：
A. Yamakage;K. Yada;M. Sato;Yukio Tanaka
我们建立了超导拓扑绝缘体（STIs）的隧穿光谱理论，其中表面Andreev束缚态（sabs）表现为螺旋马约拉纳费米子。基于母拓扑绝缘子的对称性和拓扑性质，我们发现超导超导中的sabs在能量色散上存在结构跃迁。通过调整化学势和能带的有效质量，跃迁产生了各种各样的马约拉纳费米子。我们澄清了跃迁附近的马约拉纳费米子会在正常金属/STI结之间的隧穿电导中产生稳健的零偏置峰。
We develop a theory of the tunneling spectroscopy for superconducting topological insulators (STIs), where the surface Andreev bound states (SABSs) appear as helical Majorana fermions. Based on the symmetry and topological nature of parent topological insulators, we find that the SABSs in the STIs have a structural transition in the energy dispersions. The transition results in a variety of Majorana fermions, by tuning the chemical potential and the effective mass of the energy band. We clarify that Majorana fermions in the vicinity of the transitions give rise to robust zero bias peaks in the tunneling conductance between normal metal/STI junctions.