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arXiv 1306.6304cond-mat.supr-con
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小约瑟夫森结阵列的热激活电导

Thermally activated conductance in arrays of small Josephson junctions

J. Zimmer, N. Vogt, A. Fiebig, S. V. Syzranov, A. Lukashenko, R. Schäfer, H. Rotzinger, A. Shnirman, M. Marthaler, A. V. Ustinov

摘要:

我们提出了测量的温度依赖性电导的小电容SQUID的串联阵列。在低偏置电压下,阵列表现出很强的库仑阻塞,我们详细研究了温度和约瑟夫森能量$E_J$的函数。我们发现,零偏压电导很好地描述了热激活电荷输运的激活能的顺序为$ΛE_C$,其中$Λ$是在阵列中的电荷屏蔽长度和$E_C$是一个单一的SQUID的充电能量。

英文摘要:

We present measurements of the temperature-dependent conductance for series arrays of small-capacitance SQUIDs. At low bias voltages, the arrays exhibit a strong Coulomb blockade, which we study in detail as a function of temperature and Josephson energy $E_J$. We find that the zero-bias conductance is well described by thermally activated charge transport with the activation energy on the order of $ΛE_C$, where $Λ$ is the charge screening length in the array and $E_C$ is the charging energy of a single SQUID.

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