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arXiv 2010.09759cond-mat.supr-concond-mat.mes-hall
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由磁场产生的暂时增强超导电性

Temporarily enhanced superconductivity from magnetic fields

Eirik Holm Fyhn, Jacob Linder

摘要:

相反,预期的不利影响超导时,施加磁场,我们预测,突然发病的这样一个领域可以暂时强烈增强超导序参量。具体地说,我们发现,在约瑟夫森结与正常的金属弱连接可以增加超过二十倍,以这种方式。这种效应可以从Andreev反射的能量依赖性和系统中激发的分布函数中的突然自旋依赖性偏移之间的相互作用来理解。增加的持续时间取决于系统中的非弹性散射率,估计在纳秒范围内。我们证明了这一点,通过开发一种方法,解决了Usadel方程的任意时间依赖性。这使得研究超快时间相关的物理学在异质结构结合超导体与不同类型的材料。

英文摘要:

Contrary to the expected detrimental influence on superconductivity when applying a magnetic field, we predict that the abrupt onset of such a field can temporarily strongly enhance the superconducting order parameter. Specifically, we find that the supercurrent in a Josephson junction with a normal metal weak link can increase more than twentyfold in this way. The effect can be understood from the interplay between the energy-dependence of Andreev reflection and the abrupt spin-dependent shift in the distribution functions for excitations in the system. The duration of the increase depends on the inelastic scattering rate in the system and is estimated to be in the range of nanoseconds. We demonstrate this by developing a method which solves the Usadel equation for an arbitrary time-dependence. This enables the study of ultrafast time-dependent physics in heterostructures combining superconductors with different types of materials.

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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