Finite Bias Anomaly in the Subgap Conductance of Superconductor-GaAs Junctions
W. Poirier, D. Mailly, M. Sanquer
DOI 10.1103/PhysRevLett.79.2105 · Physical Review Letters
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Abstract
We measure the subgap conductance across a superconductor-GaAs junction at low temperature. Below T=4K we observe a zero bias conductance peak. For the first time, we observe that at even lower temperatures ( T≤0.8K), the conductance peak is shifted to a finite voltage. Application of a magnetic field restores a zero bias conductance peak. This is consistent with theoretical predictions for superconducting-semiconducting junctions in the regime where the contact conductance is larger than the coherent semiconductor conductance.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Sn-Pb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6 | Pressure not reported | onset |
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