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arXiv 1101.2250cond-mat.supr-con
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小欠阻尼约瑟夫森结中的量子相位扩散

Quantum Phase Diffusion in a Small Underdamped Josephson Junction

H. F. Yu, X. B. Zhu, Z. H. Peng, Ye Tian, D. J. Cui, G. H. Chen, D. N. Zheng, X. N. Jing, Li Lu, S. P. Zhao, Siyuan Han

摘要:

在25-140 mK的宽温度范围内,证明了小型欠阻尼Nb/AlO $_x$ /Nb结($\sim$ 0.4 $μ$ m $^2$)中的量子相扩散,其中宏观量子隧道效应(MQT)是主要的逃逸机制。我们提出了一个两步跃迁模型来描述开关过程,其中考虑了从势阱的逃逸速率和从相扩散到运行态的跃迁速率。从实验中提取的开关电流分布的过渡率遵循预测的阿克里乌斯定律在热制度,但大大增强时,MQT成为主导。

英文摘要:

Quantum phase diffusion in a small underdamped Nb/AlO$_x$/Nb junction ($\sim$ 0.4 $μ$m$^2$) is demonstrated in a wide temperature range of 25-140 mK where macroscopic quantum tunneling (MQT) is the dominant escape mechanism. We propose a two-step transition model to describe the switching process in which the escape rate out of the potential well and the transition rate from phase diffusion to the running state are considered. The transition rate extracted from the experimental switching current distribution follows the predicted Arrhenius law in the thermal regime but is greatly enhanced when MQT becomes dominant.

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