Shot noise of large charge quanta in superconductor/semiconductor/superconductor junctions
F. E. Camino, V. V. Kuznetsov, E. E. Mendez, Th. Schäpers, V. A. Guzenko, H. Hardtdegen
DOI 10.1103/PhysRevB.71.020506 · Physical Review B
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Abstract
We have found experimentally that the noise of ballistic electron transport in a superconductor/semiconductor/superconductor junction is enhanced relative to the value given by the general relation, SV=2eIR2coth(eV∕2kT), for two voltage regions in which this expression reduces to its thermal and shot noise limits. The noise enhancement is explained by the presence of large charge quanta, with an effective charge q*=(1+2Δ∕eV)e, that generate a noise spectrum SV=2q*IR2, as predicted by Averin and Imam [Phys. Rev. Lett. 76, 3814 (1996)]. These charge quanta result from multiple Andreev reflections at each junction interface, which are also responsible for the subharmonic gap structure observed in the voltage dependence of the junction’s conductance.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7.5 | Pressure not reported | unknown |
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