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arXiv 1002.1207cond-mat.mes-hall
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通过AC约瑟夫森电流冷却悬浮纳米线

Cooling of a suspended nanowire by an AC Josephson current flow

Gustav Sonne, Milton E. Peña-Aza, Leonid Y. Gorelik, Robert I. Shekhter, Mats Jonson

摘要:

我们考虑一个纳米机电约瑟夫森结,其中悬浮的纳米线作为超导弱连接,并表明,施加的直流偏置电压的结果在抑制的弯曲振动的线。这种冷却效应是通过将振动能量子首先转移到电压驱动的Andreev态,然后转移到扩展的准粒子电子态来实现的。我们的分析,这是一个纳米线的金属碳纳米管的形式和密度矩阵形式主义的框架中进行的,表明这种自冷却是可能下降到一个水平,其中的最低弯曲振动模式的纳米线的平均占用数是$\sim 0.1$。

英文摘要:

We consider a nanoelectromechanical Josephson junction, where a suspended nanowire serves as a superconducting weak link, and show that an applied DC bias voltage an result in suppression of the flexural vibrations of the wire. This cooling effect is achieved through the transfer of vibronic energy quanta first to voltage driven Andreev states and then to extended quasiparticle electronic states. Our analysis, which is performed for a nanowire in the form of a metallic carbon nanotube and in the framework of the density matrix formalism, shows that such self-cooling is possible down to a level where the average occupation number of the lowest flexural vibration mode of the nanowire is $\sim 0.1$.

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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