Specular Andreev Reflection in Inversion-symmetric Weyl-semimetals
Wei Chen, Liang Jiang, R. Shen, L. Sheng, B. G. Wang, and D. Y. Xing
TL;DR
This paper investigates the unique features of Andreev reflection in inversion-symmetric Weyl semimetals, revealing anisotropic conductance for s-wave pairing and isotropic spectra for FFLO states, highlighting novel electron-hole conversion behaviors.
Contribution
It introduces the first analysis of specular Andreev reflection in Weyl semimetals, emphasizing the effects of pairing symmetry and chirality on conductance anisotropy.
Findings
Andreev conductance is anisotropic for s-wave pairing.
Andreev reflection spectrum is isotropic for FFLO pairing.
Chirality influences electron-hole conversion at the interface.
Abstract
The electron-hole conversion at the normal-metal superconductor interface in inversion-symmetric Weyl semimetals is investigated with an effective two-band model. We find that the specular Andreev reflection of Weyl fermions has two unusual features. The Andreev conductance for s-wave BCS pairing states is anisotropic, depending on the angle between the line connecting a pair of Weyl points and the normal of the junction, due to opposite chirality carried by the paired electrons. For the Fulde-Ferrell-Larkin-Ovchinnikov pairing states, the Andreev reflection spectrum is isotropic and is independent of the finite momentum of the Cooper pairs.
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