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arXiv 2003.12885cond-mat.mes-hallcond-mat.supr-con
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SNS结的动态I-V特性

Dynamical I-V Characteristics of SNS Junctions

Kevin Spahr, Jonathan Graveline, Chrustian Lupien, Marco Aprili, Bertrand Reulet

摘要:

本文通过测量超导弱连接在1-200 MHz交流偏压下的电压/电流特性,研究了超导弱连接的约瑟夫森临界电流的开关动力学。在高于其临界温度时,两个Nb库之间的弱连接由介观Al丝形成。我们观察到一个动态的相变的频率和振幅的交流电流的函数。虽然在低频下,通过增加电流偏置驱动的转变由标准Kramers理论很好地描述,但在高频下,开关直方图变得滞后并且比热波动所预期的窄得多。这两个区域之间的交叉频率由正常金属中的电子-声子相互作用速率设定。

英文摘要:

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 an 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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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