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arXiv 2102.00215cond-mat.mes-hallcond-mat.supr-con
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介观全金属器件超导电性的门控

Gate control of superconductivity in mesoscopic all-metallic devices

Claudio Puglia, Giorgio De Simoni, Francesco Giazotto

摘要:

最近证明了通过施加控制栅极电压来调节基于Bardeen-Cooper-Schrieffer金属的介观器件的超导性质的可能性。尽管在不同的材料和几何形状上获得了一些实验证据,但尚未提供基于这种非常规效应的微观机制的描述。本文讨论了金属超导体中超导性的门控技术潜力,并对实验结果进行了修正,这些结果提供了关于这种效应可能的热起源的信息:首先,我们回顾了在高临界温度元素超导体(铌和钒)上进行的实验,并展示了如何利用基于这些材料的器件来实现基本的电子工具,如,e。例如,在一个实施例中,一种半波整流器。在第二部分中,我们讨论了门控效应的起源,通过显示栅极驱动的抑制在悬浮的钛丝的超电流,并通过提供热和电开关电流的概率分布之间的比较。此外,我们讨论了冷场发射的电子从门通过有限元模拟和比较的结果与实验数据。最后,所呈现的数据提供了关于门控效应的热起源的不可能性的强有力的指示。

英文摘要:

It was recently demonstrated the possibility to tune, through the application of a control gate voltage, the superconducting properties of mesoscopic devices based on Bardeen-Cooper-Schrieffer metals. In spite of the several experimental evidence obtained on different materials and geometries, a description of the microscopic mechanism at the basis of such unconventional effect has not been provided yet. This work discusses the technological potential of gate control of superconductivity in metallic superconductors and revises the experimental results which provide information regarding a possible thermal origin of the effect: in the first place, we review experiments performed on high critical temperature elemental superconductors (niobium and vanadium) and show how devices based on these materials can be exploited to realize basic electronic tools such as, e. g., a half-wave rectifier. In a second part, we discuss the origin of the gating effect by showing the gate-driven suppression of the supercurrent in a suspended titanium wire and by providing a comparison between thermal and electric switching current probability distributions. Furthermore, we discuss the cold field-emission of electrons from the gate by means of finite element simulations and compare the results with experimental data. Finally, the presented data provide a strong indication regarding the unlikelihood of thermal origin of the gating effect.

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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