Anomalous Magnetic Field Dependence in Nanowire Josephson Junctions

Commonly, the magnetic field dependence of nanowire based Josephson junctions shows a monotonical suppression of the critical supercurrent. However, an anomalous supercurrent enhancement by magnetic field has been observed in different nanowire Josephson junctions and has been attributed to various mechanisms. Here, we present a similar observation in Ge-Si core-shell nanowire Josephson junctions and show that the interplay between the pair-breaking effect and the thermalization effect is more likely a general cause of such phenomenon.