Superconductor-nanowire devices from tunneling to the multichannel regime: Zero-bias oscillations and magnetoconductance crossover

@article{Churchill2013SuperconductornanowireDF,
  title={Superconductor-nanowire devices from tunneling to the multichannel regime: Zero-bias oscillations and magnetoconductance crossover},
  author={Hugh O. H. Churchill and Valla Fatemi and K Grove-Rasmussen and Mingtang Deng and P Caroff and H Q Xu and Charles M. Marcus},
  journal={Physical Review B},
  year={2013},
  volume={87},
  pages={241401}
}
We present transport measurements in superconductor-nanowire devices with a gated constriction forming a quantum point contact. Zero-bias features in tunneling spectroscopy appear at finite magnetic fields and oscillate in amplitude and split away from zero bias as a function of magnetic field and gate voltage. A crossover in magnetoconductance is observed: Magnetic fields above similar to 0.5 T enhance conductance in the low-conductance (tunneling) regime but suppress conductance in the high… Expand

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