Tunneling Conductance and Surface States Transition in Superconducting Topological Insulators

Details Tunneling Conductance and Surface States Transition in Superconducting Topological Insulators Tunneling Conductance and Surface States Transition in Superconducting Topological Insulators

2011-12-21

arxiv.org/abs/1112.5036v3

Physics

Condensed Matter

Superconductivity

6 pages, 4 figures

Scientific paper

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.

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