Experimental phase diagram of zero-bias conductance peaks in superconductor/semiconductor nanowire devices
Jun Chen (University of Pittsburgh)
Peng Yu (University of Pittsburgh)
John Stenger (West Virginia University)
Moïra Hocevar (ENS-PSL Research University & CNRS)
Diana Car (Eindhoven University of Technology)
Sébastien R. Plissard (Université de Toulouse)
Erik P.A.M. Bakkers (Eindhoven University of Technology, TU Delft - QuTech Advanced Research Centre, Kavli institute of nanoscience Delft, TU Delft - QN/Bakkers Lab)
Tudor D. Stanescu (West Virginia University)
Sergey M. Frolov (University of Pittsburgh)
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Abstract
Topological superconductivity is an exotic state of matter characterized by spinless p-wave Cooper pairing of electrons and by Majorana zero modes at the edges. The first signature of topological superconductivity is a robust zero-bias peak in tunneling conductance. We perform tunneling experiments on semiconductor nanowires (InSb) coupled to superconductors (NbTiN) and establish the zero-bias peak phase in the space of gate voltage and external magnetic field. Our findings are consistent with calculations for a finite-length topological nanowire and provide means for Majorana manipulation as required for braiding and topological quantum bits.