Specular Andreev reflection in inversion-symmetric Weyl semimetals
1 National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University Nanjing 210093, China
2 National Center of Microstructures and Quantum Manipulation, Nanjing University - Nanjing 210093, China
Received: 17 June 2013
Accepted: 20 July 2013
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.
PACS: 74.45.+c – Proximity effects; Andreev reflection; SN and SNS junctions / 73.23.-b – Electronic transport in mesoscopic systems
© EPLA, 2013