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Tunneling spectroscopy of quasiparticle bound states in a spinful Josephson junction
W Chang1, V E Manucharyan, T S Jespersen
1Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA.
Abstract:
The spectrum of a segment of InAs nanowire, confined between two superconducting leads, was measured as function of gate voltage and superconducting phase difference using a third normal-metal tunnel probe. Subgap resonances for odd electron occupancy-interpreted as bound states involving a confined electron and a quasiparticle from the superconducting leads, reminiscent of Yu-Shiba-Rusinov states-evolve into Kondo-related resonances at higher magnetic fields. An additional zero-bias peak of unknown origin is observed to coexist with the quasiparticle bound states.
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