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首页> 外文期刊>Physical review >Thermal hopping and retrapping of a Brownian particle in the tilted periodic potential of a NbN/MgO/NbN Josephson junction
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Thermal hopping and retrapping of a Brownian particle in the tilted periodic potential of a NbN/MgO/NbN Josephson junction

机译：NbN / MgO / NbN约瑟夫森结的倾斜周期电势中布朗粒子的热跳跃和重新俘获

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摘要

We report on the occurrence of multiple hopping and retrapping of a Brownian particle in a tilted washboard potential. The escape dynamic has been studied experimentally by measuring the switching current distributions as a function of temperature in a moderately damped NbN/MgO/NbN Josephson junction. At low temperatures the second moment of the distribution increases in agreement with calculations based on Kramers thermal activation regime. After a turnover temperature T~*, the shape of the distributions starts changing and width decreases with temperature. We analyze the data through fit of the switching probability and Monte Carlo simulations and we find a good agreement with a model based on a multiple retrapping process.
机译：我们报告倾斜搓板电位中布朗粒子的多次跳跃和重新捕获的发生。通过在中等阻尼的NbN / MgO / NbN Josephson结中测量开关电流分布随温度的变化，对逃逸动力学进行了实验研究。在低温下，分布的第二阶矩与基于Kramers热活化机制的计算一致。在周转温度T〜*之后，分布的形状开始变化，宽度随温度降低。我们通过切换概率和蒙特卡洛模拟的拟合来分析数据，并且发现与基于多重重陷过程的模型有很好的一致性。

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  • 来源
    《Physical review》 |2011年第18期|p.184504.1-184504.6|共6页
  • 作者

    Luigi Longobardi; Davide Massarotti; Giacomo Rotoli; Daniela Stornaiuolo; Gianpaolo Papari; Akira Kawakami; Giovanni Piero Pepe; Antonio Barone; Francesco Tafuri;

  • 作者单位

    Seconda Universitd degli Studi di Napoli, Dipartimento di Ingegneria dell Informazione, via Roma 29,1-81031 Aversa (Ce), Italy,CNR-SPIN UOS Napoli, Complesso Universitario di Monte Sant'Angelo via Cinthia, 1-80126 Napoli (Na), Italy;

    CNR-SPIN UOS Napoli, Complesso Universitario di Monte Sant'Angelo via Cinthia, 1-80126 Napoli (Na), Italy,Universitd degli Studi di Napoli 'Federico II', Dipartimento di Scienze Fisiche, via Cinthia, 1-80126 Napoli (Na), Italy;

    Seconda Universitd degli Studi di Napoli, Dipartimento di Ingegneria dell Informazione, via Roma 29,1-81031 Aversa (Ce), Italy;

    CNR-SPIN UOS Napoli, Complesso Universitario di Monte Sant'Angelo via Cinthia, 1-80126 Napoli (Na), Italy;

    NEST, CNR-NANO, and Scuola Normale Superiore di Pisa, Piazza dei Cavalieri 7,1-56126 Pisa, Italy;

    Advanced 1CT Research Institute, National Institute of Information and Communications Technology, 588-2 Iwaoka-cho, Nishi-ku, Kobe 651-2492, Japan;

    CNR-SPIN UOS Napoli, Complesso Universitario di Monte Sant'Angelo via Cinthia, 1-80126 Napoli (Na), Italy,Universitd degli Studi di Napoli 'Federico II', Dipartimento di Scienze Fisiche, via Cinthia, 1-80126 Napoli (Na), Italy;

    CNR-SPIN UOS Napoli, Complesso Universitario di Monte Sant'Angelo via Cinthia, 1-80126 Napoli (Na), Italy,Universitd degli Studi di Napoli 'Federico II', Dipartimento di Scienze Fisiche, via Cinthia, 1-80126 Napoli (Na), Italy;

    Seconda Universitd degli Studi di Napoli, Dipartimento di Ingegneria dell Informazione, via Roma 29,1-81031 Aversa (Ce), Italy,CNR-SPIN UOS Napoli, Complesso Universitario di Monte Sant'Angelo via Cinthia, 1-80126 Napoli (Na), Italy;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    tunneling phenomena; point contacts, weak links, josephson effects; brownian motion; josephson devices;

    机译：隧道现象;点接触;薄弱环节;约瑟夫森效应;布朗运动约瑟夫森设备;

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