On the origin of the controversial electrostatic field effect in superconductors.
On the origin of the controversial electrostatic field effect in superconductors.
复制标题
关于超导体中备受争议的静电场效应的起源。
DOI：
10.1038/s41467-021-22998-0
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发表时间：
2021-05-12
影响因子：
16.6
通讯作者：
Tsepelin V
中科院分区：
文献类型：
--
作者：
Golokolenov I;Guthrie A;Kafanov S;Pashkin YA;Tsepelin V
超导量子器件提供了许多应用，从电气计量和磁传感到节能高端计算和先进量子信息处理。量子电路的关键元件是由电流或磁场控制的（单和双）约瑟夫森结。通常通过静电场效应在半导体器件中使用的电压控制将更加通用和实用。因此，最近在超导器件中报道的场效应如果得到证实，可能会彻底改变整个超导电子学领域。在这里，我们证明了场效应对临界电流的抑制，可以用超导器件收缩中的准粒子激发来解释。我们的研究结果表明，栅极和器件收缩之间的微小泄漏电流完全遵循金属电极电子场发射的Fowler-Nordheim模型，并注入具有足以削弱甚至抑制超导性的能量的准粒子。最近一份关于超导器件静电场效应的报告为先进量子技术提供了巨大的潜力，但仍存在争议。在这里，作者报告说，临界电流的抑制，归因于场效应，可以用超导器件收缩中的准粒子激发来解释。
Superconducting quantum devices offer numerous applications, from electrical metrology and magnetic sensing to energy-efficient high-end computing and advanced quantum information processing. The key elements of quantum circuits are (single and double) Josephson junctions controllable either by electric current or magnetic field. The voltage control, commonly used in semiconductor-based devices via the electrostatic field effect, would be far more versatile and practical. Hence, the field effect recently reported in superconducting devices may revolutionise the whole field of superconductor electronics provided it is confirmed. Here we show that the suppression of the critical current attributed to the field effect, can be explained by quasiparticle excitations in the constriction of superconducting devices. Our results demonstrate that a miniscule leakage current between the gate and the constriction of devices perfectly follows the Fowler-Nordheim model of electron field emission from a metal electrode and injects quasiparticles with energies sufficient to weaken or even suppress superconductivity. A recent report on electrostatic field effect in superconducting devices provides a high potential for advanced quantum technology, but it remains controversial. Here, the authors report that the suppression of critical current, which was attributed to the field effect, can instead be explained by quasiparticle excitations in the constriction of superconducting devices.
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影响因子：
38.3
作者：
Alegria, Loren D.;Bottcher, Charlotte G. L.;Yacoby, Amir
通讯作者：
Yacoby, Amir
DOI：
10.1109/tdei.2013.6571470
发表时间：
2013-08-01
影响因子：
3.1
作者：
Lyon, David;Hubler, Alfred
通讯作者：
Hubler, Alfred
影响因子：
4
作者：
Morpurgo, AF;Klapwijk, TM;van Wees, BJ
通讯作者：
van Wees, BJ
影响因子：
4.6
作者：
Paolucci, Federico;De Simoni, Giorgio;Giazotto, Francesco
通讯作者：
Giazotto, Francesco
影响因子：
38.3
作者：
De Simoni, Giorgio;Paolucci, Federico;Giazotto, Francesco
通讯作者：
Giazotto, Francesco