Weyl半金属
物理
安德列夫反射
半金属
凝聚态物理
超导电性
镜面反射
各向异性
费米面
望远镜
量子力学
带隙
出处
期刊:Physical review
日期:2017-10-20
卷期号:96 (15)
被引量:37
标识
DOI:10.1103/physrevb.96.155305
摘要
We study the Andreev reflections (ARs) at the interface of the type-II Weyl semimetal-superconductor junctions and find double ARs when the superconductor is put in the Weyl semimetal band tilting direction, which is similar to the double reflections of light in anisotropic crystals. The directions of the double (retro and specular) ARs are symmetric about the normal due to the hyperboloidal Fermi surface near the Weyl nodes, but with different AR amplitudes depending on the incident electron. When the normal direction of the Weyl semimetal-superconductor interface is changed from parallel to perpendicular with the band tilt, the double ARs gradually evolve into one retro-AR and one normal reflection, resulting in an anisotropic differential conductance, which is a unique observable signature for the double ARs in experiments.
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