Double Andreev reflections in type-II Weyl semimetal-superconductor junctions

Zhe Hou; Qing-Feng Sun

doi:10.1103/PhysRevB.96.155305

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Double Andreev reflections in type-II Weyl semimetal-superconductor junctions

Zhe Hou, Qing-Feng Sun

DOI 10.1103/PhysRevB.96.155305 · Physical Review B

T1

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Abstract

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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
LaAlGe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
WTe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
MoTe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown