Shiba states of an Anderson impurity in hybrid normal-superconducting systems

Abstract

Many schemes for detecting the presence of Majorana zero-energy states in semiconductor nanowires coupled to superconductors involve a weakly coupled normal-state electrode for performing the tunneling spectroscopy. Since the normal-state electrode can lead to zero-bais anomalies associated with Kondo screening. It is important to better understand the phase diagram and spectral features of an Anderson impurity coupled to both superconducting and normal-state leads, in particular in the presence of magnetic field. I will also present detailed results for the Shiba doublet state splitting in magnetic field, which reveal a surprisingly linear dependence between the field of singlet-doublet crossing and the hybridization strength.