Coherent multiple charge transfer in a superconducting NbN tunnel junction.

@article{Uzawa2005CoherentMC,
  title={Coherent multiple charge transfer in a superconducting NbN tunnel junction.},
  author={Yoshinori Uzawa and Zhen Wang},
  journal={Physical review letters},
  year={2005},
  volume={95 1},
  pages={017002}
}
We measured shot noise and submillimeter-wave response in a superconducting NbN tunnel junction that had a subharmonic gap structure on the current-voltage (I-V) curve. We found that the observed effective charge, defined from the noise-current ratio, tends to a steplike function of voltage. In the presence of submillimeter-wave radiation of frequency v, novel step structures spaced by hv/2e below and above the half-gap voltage clearly appeared on the I-V curve, overlapping the ordinary photon… CONTINUE READING

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