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arXiv 1407.7728cond-mat.mes-hall
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感应环境中约瑟夫森结的布洛赫带动力学

Bloch band dynamics of a Josephson junction in an inductive environment

T. Weißl, G. Rastelli, I. Matei, I. M. Pop, O. Buisson, F. W. J. Hekking, W. Guichard

摘要:

我们测量了嵌入在由SQUID链提供的电感环境中的具有可调约瑟夫森能量$E_J$的约瑟夫森结的电流-电压特性。这样的环境会导致电荷在结上的局部化,这会导致电路的零偏置电阻的增强。我们理解这一结果定量方面的布洛赫带动力学的本地化电荷。这种动力学由约瑟夫森结的最低布洛赫带中的扩散以及从最低带到较高带的朗道-齐纳跃迁控制。另外,对应于SQUID阵列的自谐振模式的频率超过可调谐结的约瑟夫森能量$E_J$,这导致$E_J$的重整化,并且因此导致最低布洛赫带的有效带宽的重整化。

英文摘要:

We have measured the current-voltage characteristics of a Josephson junction with tunable Josephson energy $E_J$ embedded in an inductive environment provided by a chain of SQUIDs. Such an environment induces localization of the charge on the junction, which results in an enhancement of the zero-bias resistance of the circuit. We understand this result quantitatively in terms of the Bloch band dynamics of the localized charge. This dynamics is governed by diffusion in the lowest Bloch band of the Josephson junction as well as by Landau-Zener transitions out of the lowest band into the higher bands. In addition, the frequencies corresponding to the self-resonant modes of the SQUID array exceed the Josephson energy $E_J$ of the tunable junction, which results in a renormalization of $E_J$, and, as a consequence, of the effective bandwidth of the lowest Bloch band.

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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