Abstract

We investigate the Andreev reflection across a graphene-based superconducting junction irradiated by the linearly polarized off-resonant light. The band structure of graphene is modified by the linearly polarized light, which leads to the anisotropic band structure of graphene. In the coaction of the linearly polarized light and the direction of superconducting junction, three anomalous phenomena, consisting of the Andreev retroreflection (specular Andreev reflection) in the case of interband (intraband) conversion of electron–hole and the nonzero incident angle of perfect Andreev reflection, happen. These three anomalous phenomena arise from the same reason that the relation between wavevector and velocity in the isotropic band structure is broken up in the light-induced anisotropic band structure. Our finding provides an alternative and flexible method to modulate Andreev reflection.

Graphical abstract

中文翻译：

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基于石墨烯的超导结中的光调制反常安德烈夫反射

摘要

我们研究了线偏振非共振光照射的石墨烯基超导结上的 Andreev 反射。石墨烯的能带结构被线偏振光修饰，导致石墨烯的能带结构各向异性。在线偏振光与超导结方向的共同作用下，出现了三种反常现象，即电子-空穴带间（带内）转换情况下的安德列夫回射（镜面安德列夫反射）和完美安德列夫的非零入射角反思，发生。这三种反常现象的产生原因相同，即在光致各向异性能带结构中，各向同性能带结构中的波矢量和速度之间的关系被打破了。

图形概要