Experimental phase diagram of zero-bias conductance peaks in superconductor/semiconductor nanowire devices

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Science Advances  08 Sep 2017:
Vol. 3, no. 9, e1701476
DOI: 10.1126/sciadv.1701476

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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.

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