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arXiv 1101.0159cond-mat.supr-con
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介观超导器件中整流效应的模拟

Modeling Rectification Effects in Mesoscopic Superconducting Devices

M. F. Carusela, V. P. Ramunni, V. I. Marconi

摘要:

研究了小约瑟夫森结环(JJR)的热涨落和电容效应,这种热涨落和电容效应模拟了最近在三角形介观超导体中观察到的整流现象,起因于场致持续电流与偏置电流的叠加.在有限的温度下,我们预测的整流信号的幅度强烈依赖于电流接触配置上的JJR,在符合实验。此外,我们分析的参数范围内的电容结的闭环是一个合适的模型来解释实验观察。我们的结论是,闭环的薄弱环节,一个JJR,是一个简单的,强大的和足够好的模型来解释所观察到的电压整流效应的介观超导样品在很宽的温度范围。

英文摘要:

We study thermal fluctuations and capacitive effects on small Josephson Junction Rings (JJR) that mimics the rectification phenomena recently observed in triangle shaped mesoscopic superconductors, due to the superposition of the field induced persistent current with the bias current. At finite temperature we predicted that the amplitude of the rectified signal depends strongly on the current contacts configuration on the JJR, in coincidence with experiments. In addition we analize the range of parameters where a closed loop of capacitive junctions is an appropriate model to explain the experimental observations. We conclude that the closed loop of weak links, a JJR, is a simple, robust and good enough model to explain the observed voltage rectification effects on mesoscopic superconducting samples for a wide range of temperature.

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