Thursday, April 25, 2013

1304.6477 (Wei Chen et al.)

Specular Andreev Reflection in Inversion-symmetric Weyl-semimetals    [PDF]

Wei Chen, Liang Jiang, R. Shen, L. Sheng, B. G. Wang, D. Y. Xing
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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