Closing of the induced gap in a hybrid superconductor-semiconductor nanowire
Denise Puglia, Esteban A. Martinez, Gerbold C. Ménard, Andreas Pöschl, Sergei Gronin, G. C. Gardner, Ray Kallaher, Michael J. Manfra, C. M. Marcus, Andrew Higginbotham, Lucas Casparis
Abstract
Conclusively identifying Majorana modes in nanowires is an long-standing experimental challenge. Within the field, consensus is emerging that achieving this goal will require measurements on three-terminal devices. Here, the authors report some of the first results on such devices using nonlocal conductance. They find that zero-bias peaks are preceded by the closure of the bulk gap, which indicates that in these devices zero-bias peaks are associated with bulk properties of the nanowire. However, the behavior of the device after gap closure suggests that disorder remains an important limitation.