Observation of Energy Levels Quantization in Underdamped Josephson Junctions above the Classical-Quantum Regime Crossover Temperature
P. Silvestrini, V. G. Palmieri, B. Ruggiero, M. Russo
DOI 10.1103/PhysRevLett.79.3046 · Physical Review Letters
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Abstract
We present a clear observation of the presence of energy levels quantization in high quality Nb−AlOx−Nb underdamped Josephson junctions at temperatures above the quantum crossover temperature. This has been possible by extending the measurements of the escape rate out of the zero-voltage state at higher sweeping frequency ( dI/dt up to 25 A/sec) in order to induce nonstationary conditions in the energy potential describing the junction dynamics.
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. | — | Pressure not reported | unknown |
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