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首页> 外文期刊>Superconductor Science & Technology >Proximity effect in a superconductor/two-dimensional electron gas junction with Rashba spin__orbit coupling
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Proximity effect in a superconductor/two-dimensional electron gas junction with Rashba spin__orbit coupling

机译：具有Rashba自旋轨道耦合的超导体/二维电子气结中的邻近效应

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摘要

We study theoretically the proximity effect in a conventional superconductor/two-dimensional electron gas (2DEG) junction in the presence of Rashba spin_orbit coupling (RSOC). By means of the fluctuation-dissipation theorem and Green's function method, the superconductivity correlation function in the 2DEG region could be resolved in the clean limit. It is found that the perpendicular injection of quasiparticles through the interface can only induce singlet superconductivity correlation in the 2DEG region and in this case the RSOC of the 2DEG can hardly affect the proximity effect, whereas the oblique injection of quasiparticles can give rise to not only singlet but also triplet superconductivity correlations in the RSOC region. The latter correlation exhibits a damped oscillating behavior and even reverses its sign. In the case of perpendicular injection, triplet superconductivity correlation can also be induced in the 2DEG region as long as a uniform ferromagnetic interaction is present.
机译：我们在理论上研究了存在Rashba自旋轨道耦合（RSOC）的常规超导体/二维电子气（2DEG）结中的邻近效应。借助于波动耗散定理和格林函数方法，可以将2DEG区域内的超导相关函数分解为纯净极限。发现通过界面垂直注入准粒子只能在2DEG区域中诱导单重态超导相关，在这种情况下2DEG的RSOC几乎不会影响邻近效应，而准粒子的倾斜注入不仅会引起RSOC区域中的单重态和三重态超导相关。后一种相关性表现出阻尼的振荡行为，甚至颠倒其符号。在垂直注入的情况下，只要存在均匀的铁磁相互作用，也可以在2DEG区域中感应出三重态超导相关性。

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