Tunneling Spectroscopy of Quasiparticle Bound States in a Spinful   Josephson Junction
  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. Sub-gap 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. 
W. Chang, V. E. Manucharyan, T. S. Jespersen, J. Nygard, C. M. Marcus
cond-mat.mes-hall cond-mat.supr-con