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Theory of tunneling conductance and surface-state transition in superconducting topological insulators

2012; American Physical Society; Volume: 85; Issue: 18 Linguagem: Inglês

10.1103/physrevb.85.180509

1550-235X

Ai Yamakage, Keiji Yada, Masatoshi Sato, Yukio Tanaka,

Advanced Condensed Matter Physics

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 profound 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.