Andreev reflections in black phosphorus based normal-superconducting junctions modulated by linearly polarized light

安德列夫反射 超导电性 黑磷 凝聚态物理 物理 光电子学
作者
Shu-Gang Chen,Xiangru Kong,Bin-Yuan Zhang,Wei‐Jiang Gong
出处
期刊:Physical review [American Physical Society]
卷期号:109 (16) 被引量:1
标识
DOI:10.1103/physrevb.109.165418
摘要

We perform investigations about the Andreev reflections (ARs) in normal-superconducting (NS) junctions based on the few-layer black phosphorus, by considering the irradiation of the linearly polarized off-resonant light. Following the analysis on the band structures, we propose the types of ARs in such NS junctions. Specifically, it has been found that when the incident energy $E$ is less than the Fermi energy ${E}_{F}$, the intraband retro AR occurs, and otherwise the interband specular AR is achieved. A forbidden region of ARs is formed between the retro AR and the specular AR since the band gap leads to a momentum-filtering feature. By using the linearly polarized off-resonant light along $y$ direction, we are allowed to modify the size of this forbidden region. On the other hand, when the normal direction of the NS-junction interface is changed from parallel to perpendicular, by using the linearly polarized off-resonant light along $x$ direction, the retro and specular ARs can be transformed into each other, resulting in an anisotropic differential conductance, which is a unique observable signature for AR in the experiment.
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