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Anisotropic Andreev reflection across a borophane-based superconducting junction

We investigate the Andreev reflection across a borophane-based superconducting junction in different directions of junction. There are three exotic properties which are different from the ones in graphene. Firstly, the Andreev retro-reflection happens in the interband conversion of electron-hole. Secondly, the electron-hole conversion in the intraband leads to the specular Andreev reflection. Thirdly, the perfect Andreev reflection, the electron-hole conversion with unit efficiency, happens at a nonzero incident angle of electron. These three unique properties arise from the anisotropic band structure of borophane and can be modulated by adjusting the direction of junction. Our findings give a new perspective for understanding Andreev reflection.