Coherent Multiple Charge Transfer in a Superconducting NbN Tunnel Junction
Y. Uzawa, Z. Wang
DOI 10.1103/PhysRevLett.95.017002 · Physical Review Letters
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Abstract
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 ν, novel step structures spaced by hν/2e below and above the half-gap voltage clearly appeared on the I−V curve, overlapping the ordinary photon-assisted tunneling steps spaced by hν/e. Observation of these features provides clear evidence that coherent multiple Andreev reflection processes occur in the NbN tunnel junction with low barrier transparency.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| NbN Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 15.7 | Pressure not reported | unknown |
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