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arXiv 1012.4846cond-mat.mes-hall
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持续电流噪声

Persistent current noise

Andrew G. Semenov, Andrei D. Zaikin

摘要:

我们证明,只要电流算符不与系统的总汉密尔顿对易,介观环和纳米环中的持续电流可能会波动到零温度。对于环上的量子粒子模型,我们明确评估PC噪声功率,其具有尖锐的峰的形式,其对于多通道环或存在耗散而变宽。PC噪声可以通过外部磁通量来调谐,这是系统中量子相干性的基本表现。

英文摘要:

We demonstrate that persistent current in meso- and nanorings may fluctuate down to zero temperature provided the current operator does not commute with the total Hamiltonian of the system. For a model of a quantum particle on a ring we explicitly evaluate PC noise power which has a form of sharp peaks which become broadened for multi-channel rings or in the presence of dissipation. PC noise can be tuned by an external magnetic flux which is a fundamental manifestation of quantum coherence in the system.

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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