Enhanced zero-bias conductance peak and splitting at mesoscopic interfaces between an -wave superconductor and a 3D Dirac semimetal
arXiv:1612.09064 · doi:10.1063/1.4972966
Abstract
Mesoscopic point contacts between elemental metals and the topological 3D Dirac semimetal CdAs have been recently shown to be superconducting with unconventional pairing while CdAs itself does not superconduct. Here we show that the same superconducting phase at mesoscopic interfaces on CdAs can be induced with a known conventional superconductor Nb where a pronounced zero-bias conductance peak is observed which undergoes splitting in energy under certain conditions. The observations are consistent with the theory of the emergence of Andreev bound states (ABS) due to the presence of a pair potential with broken time reversal symmetry. The data also indicate the possibility of Majorana bound states as expected at the interfaces between -wave superconductors and topologically non-trivial materials with high degree of spin-orbit coupling.
arXiv comment10 pages, 3figures
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