Andreev reflection of massive pseudospin-1 fermions

• Main Authors: Shen, R. (Author), Zeng, W. (Author)
• Format: Article
• Language: English
• Published: IOP Publishing Ltd 2022
• Subjects: Andreev reflection; Dirac fermions; Doping (additives); Energy gap; Flat band; N-doped; Normal metals; normal metal-superconductor junction; Normal metal-superconductor junction; Phosphorus; Pseudospin; Pseudospin-1 fermion; pseudospin-1 fermions; Reflection probability; Superconductor junctions
• Online Access: View Fulltext in Publisher

 We theoretically investigate the Andreev reflection of the massive pseudospin-1 Dirac fermions including the +U-Type, the-U-Type, and the S z -Type mass terms, corresponding to the flat band locating at the top, the bottom, and the center of the band gap, respectively. For the ±U-Type fermions, it is found that the Andreev reflection probability at the oblique incidence can be even larger than that at the normal incidence. For the retro-reflection, such an oblique enhancement occurs in the n-doped +U-Type (p-doped-U-Type) massive fermion systems. While for the specular reflection, the enhancement occurs in the n-doped-U-Type (p-doped +U-Type) systems. For the S z -Type massive fermions, an ideal Andreev reflection with all-Angle unit efficiency is predicted in an undoped junction with the incident energy equal to the superconducting gap. © 2022 The Author(s). Published by IOP Publishing Ltd on behalf of the Institute of Physics and Deutsche Physikalische Gesellschaft.