Dynamical voltage-current characteristics of SNS junctions
| Autor: | Marco Aprili, Bertrand Reulet, Jonathan Graveline, Christian Lupien, Kevin Spahr |
|---|---|
| Přispěvatelé: | Institut Quantique [Sherbrooke] (UdeS), Université de Sherbrooke (UdeS) |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Superconductivity
Physics [PHYS]Physics [physics] Phase transition Mesoscopic physics Condensed matter physics Thermal fluctuations 02 engineering and technology Low frequency 021001 nanoscience & nanotechnology 01 natural sciences Amplitude 0103 physical sciences Current (fluid) 010306 general physics 0210 nano-technology ComputingMilieux_MISCELLANEOUS Voltage |
| Zdroj: | Physical Review B Physical Review B, American Physical Society, 2020, 102 (10), ⟨10.1103/PhysRevB.102.100504⟩ |
| ISSN: | 2469-9950 2469-9969 |
| DOI: | 10.1103/PhysRevB.102.100504⟩ |
| Popis: | We have probed the switching dynamics of the Josephson critical current of a superconducting weak link by measuring its voltage/current characteristics while applying an ac current bias in the range 1--200 MHz. The weak link between two Nb reservoirs is formed by a mesoscopic Al wire above its critical temperature. We observe a dynamical phase transition as a function of the frequency and amplitude of the ac current. While at low frequency the transition driven by increasing the current bias is well described by the standard Kramers theory, at high frequency the switching histograms become hysteretic and much narrower than expected by thermal fluctuations. The crossover frequency between the two regimes is set by the electron-phonon interaction rate in the normal metal. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|