Unconventional superconductivity and paramagnetic Meissner response triggered by nonlocal pairing interaction in proximitized heterostructures,Physical Review B

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Unconventional superconductivity and paramagnetic Meissner response triggered by nonlocal pairing interaction in proximitized heterostructures
Physical Review B ( IF 3.2 ) Pub Date : 2024-09-09 , DOI: 10.1103/physrevb.110.094503
A. A. Kopasov _{1,

2} , A. S. Mel'nikov _{1,

2,

3}

Affiliation

Proximity phenomena and induced superconducting correlations in heterostructures are shown to be strongly affected by the nonlocal nature of the electronic attraction. The latter can trigger the formation of Cooper pairs consisting of electrons localized in neighboring layers even in the absence of direct quasiparticle transfer between the layers. We investigate the manifestations of such nonlocal pairing and resulting unconventional induced superconductivity in an exemplary two-dimensional (2D) electronic system coupled to a conventional superconductor. The interplay between the quasiparticle tunneling and spin-triplet interlayer pairing is shown to generate the odd-frequency superconducting correlations in the 2D material which give rise to the paramagnetic contribution to the Meissner response and affect the energy resolved quasiparticle density of states. Experimental evidence for the above nonlocal interface pairing would provide new perspectives in engineering the unconventional superconducting correlations in heterostructures.

中文翻译：

邻近异质结构中非局域配对相互作用触发的非常规超导和顺磁迈斯纳响应

异质结构中的邻近现象和感应超导相关性被证明受到电子吸引力的非局域性质的强烈影响。即使层之间没有直接的准粒子转移，后者也可以触发由位于相邻层中的电子组成的库珀对的形成。我们研究了在耦合到传统超导体的示例性二维（2D）电子系统中这种非局域配对的表现以及由此产生的非常规感应超导性。准粒子隧道效应和自旋三重态层间配对之间的相互作用被证明会在二维材料中产生奇频超导相关性，从而产生对迈斯纳响应的顺磁贡献并影响能量解析的准粒子态密度。上述非局域界面配对的实验证据将为异质结构中非常规超导相关性的工程提供新的视角。

更新日期：2024-09-09

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