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arXiv 1306.5456cond-mat.mes-hallcond-mat.supr-con
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量子相位滑环中的持续电流

Persistent currents in quantum phase slip rings

Andrew G. Semenov, Andrei D. Zaikin

摘要:

研究了相互作用量子相位滑移对超导纳米线和纳米环在外加磁通量作用下持续电流及其涨落的影响。我们推导出这些系统的有效作用,并将原问题映射到一个有效的正弦戈登理论上的环面。我们评估的通量依赖持续电流和临界半径的环超过这个电流得到指数抑制量子涨落。我们还分析了量子相位滑移引起的持续电流的涨落。在低温下,超电流噪声谱具有相干峰的形式,可以通过磁通量进行调谐。这些峰的实验观测可以直接证明超导纳米环中等离子体模的存在。

英文摘要:

We investigate the effect of interacting quantum phase slips on persistent current and its fluctuations in ultrathin superconducting nanowires and nanorings pierced by the external magnetic flux. We derive the effective action for these systems and map the original problem onto an effective sine-Gordon theory on torus. We evaluate both the flux dependent persistent current and the critical radius of the ring beyond which this current gets exponentially suppressed by quantum fluctuations. We also analyze fluctuations of persistent current caused by quantum phase slips. At low temperatures the supercurrent noise spectrum has the form of coherent peaks which can be tuned by the magnetic flux. Experimental observation of these peaks can directly demonstrate the existence of plasma modes in superconducting nanorings.

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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