Tuning Yu-Shiba-Rusinov States in a Quantum Dot
  We present transport spectroscopy of sub-gap states in a bottom gated InAs nanowire coupled to a normal lead and a superconducting aluminium lead. The device shows clearly resolved sub-gap states which we can track as the coupling parameters of the system are tuned and as the gap is closed by means of a magnetic field. We systematically extract system parameters by using numerical renormalization group theory fits as a level of the quantum dot is tuned through a quantum phase transition electrostatically and magnetically. We also give an intuitive description of sub-gap excitations. 
Anders Jellinggaard, Kasper Grove-Rasmussen, Morten Hannibal Madsen,   and Jesper Nyg\r{a}rd
cond-mat.supr-con