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首页> 外文期刊>Physica, C. Superconductivity and its applications >Sharp superconductor-insulator transition in short wires
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Sharp superconductor-insulator transition in short wires

机译：短导线中的尖锐超导体-绝缘体过渡

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Recent experiments on short MoGe nanowires show a sharp superconductor-insulator transition tuned by the normal state resistance of the wire, with a critical resistance of R-c approximate to R-Q = h/(4e(2)). These results are at odds with a broad range of theoretical work on Josephson-like systems that predicts a smooth transition, tuned by the value of the resistance that shunts the junction. We develop a self-consistent renormalization group treatment of interacting phase-slips and their dual counterparts, correlated cooper pair tunneling, beyond the dilute approximation. This analysis leads to a very sharp transition with a critical resistance of RQ. The addition of the quasi-particles' resistance at finite temperature leads to a quantitative agreement with the experimental results. This self-consistent renormalization group method should also be applicable to other physical systems that can be mapped onto similar sine-Gordon models, in the previously inaccessible intermediate-coupling regime. (c) 2007 Elsevier B.V. All rights reserved.
机译：最近在短MoGe纳米线上进行的实验表明，通过导线的正常状态电阻可以调节尖锐的超导体-绝缘体转变，其临界电阻R-c近似于R-Q = h /（4e（2））。这些结果与在类似于约瑟夫森的系统上进行的广泛理论研究不一致，该系统预测平滑过渡，并通过使结分流的电阻值进行调整。我们开发了一种相互一致的相移及其对偶滑动，相关库珀对隧穿，超越稀疏近似的自洽重整化组处理。该分析导致具有RQ临界电阻的非常尖锐的过渡。在有限温度下增加准粒子的电阻导致与实验结果在数量上一致。这种自洽的重归一化组方法也应适用于在以前无法访问的中间耦合方案中可以映射到类似正弦-戈登模型的其他物理系统。 （c）2007 Elsevier B.V.保留所有权利。

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