Enhanced zero-bias majorana peak in the differential tunneling conductance of disordered multisubband quantum-wire/superconductor junctions

Pientka, Falko and Kells, Graham and Romito, Alessandro and Brouwer, Piet W. and Von Oppen, Felix (2012) Enhanced zero-bias majorana peak in the differential tunneling conductance of disordered multisubband quantum-wire/superconductor junctions. Physical review letters, 109 (22): 227006. ISSN 0031-9007

Abstract

A recent experiment Mourik etal. on InSb quantum wires provides possible evidence for the realization of a topological superconducting phase and the formation of Majorana bound states. Motivated by this experiment, we consider the signature of Majorana bound states in the differential tunneling conductance of multisubband wires. We show that the weight of the Majorana-induced zero-bias peak is strongly enhanced by mixing of subbands, when disorder is added to the end of the quantum wire. We also consider how the topological phase transition is reflected in the gap structure of the current-voltage characteristic.