Theory of tunneling spectroscopy for chiral topological superconductors

Abstract

We study the charge conductance of an interface between a normal metal and a superconducting quantum anomalous Hall system, based on the recursive Green's function. The angle resolved conductance gamma(ky, eV) with the momentum ky parallel to the interface and the bias voltage V shows a rich structure depending on the Chern number N of the system. We find that when the bias voltage is tuned to the energy dispersion of the edge mode, eV = Eedge(ky), the angle resolved conductance gamma(ky,Eedge(ky)) shows a pronounced even-odd effect; the conductance vanishes for N = 0 or 2 while it takes a universal value 2e^2/h for N = 1. In particular, in N = 2 phase, we find that the conductance gamma(ky,Eedge(ky)) becomes zero due to interference of two degenerate Majorana edge modes, although the corresponding surface spectral weight remains non-zero.

arXiv comment10 pages, 10 figures

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• Correlated spin currents generated by resonant crossed Andreev reflections in topological superconductors
• Majorana Fermions and Multiple Topological Phase Transition in Kitaev Ladder Topological Superconductors
• Disorder-induced Majorana zero modes in a dimerized Kitaev superconductor chain
• Anomalous interference in Aharonov-Bohm rings with two Majorana bound states
• Tunneling spectroscopy of topological superconductors
• Interference of Majorana fermions in NS junctions
• Floquet Majorana fermions in driven hexagonal lattice systems
• The vortex core excitation spectrum in gapped topological d-wave superconductors
• Theory of Josephson Current on a Magnetically Doped Topological Insulator
• Selective equal spin Andreev reflection at vortex core center in magnetic semiconductor-superconductor heterostructure
• Theory of Tunneling Effect in 1D AIII-class Topological Insulator (Nanowire) Proximity Coupled with a Superconductor
• Disorder-induced chiral and helical Majorana edge modes in a two-dimensional Ammann-Beenker quasicrystal
• Possible topological phases in quantum anomalous Hall insulator/unconventional superconductor hybrid systems