Dirac surface states and nature of superconductivity in noncentrosymmetric BiPd
MetadataShow full item record
Altmetrics Handle Statistics
Altmetrics DOI Statistics
In non-magnetic bulk materials, inversion symmetry protects the spin degeneracy. If the bulk crystal structure lacks a centre of inversion, however, spin-orbit interactions lift the spin degeneracy, leading to a Rashba metal whose Fermi surfaces exhibit an intricate spin texture. In superconducting Rashba metals a pairing wavefunction constructed from these complex spin structures will generally contain both singlet and triplet character. Here we examine possible triplet components of the order parameter in noncentrosymmetric BiPd, combining for the first time in a noncentrosymmetric superconductor macroscopic characterization, atomic-scale ultra-low temperature scanning tunnelling spectroscopy, and relativistic first-principles calculations. While the superconducting state of BiPd appears topologically trivial, consistent with Bardeen-Cooper-Schrieffer theory with an order parameter governed by a single isotropic s-wave gap, we show that the material exhibits Dirac-cone surface states with a helical spin polarization.
Sun , Z , Enayat , M , Maldonado , A I , Lithgow , C , Yelland , E , Peets , D C , Yaresko , A , Schnyder , A P & Wahl , P 2015 , ' Dirac surface states and nature of superconductivity in noncentrosymmetric BiPd ' , Nature Communications , vol. 6 , 6633 . https://doi.org/10.1038/ncomms7633
Copyright © 2015 the Author(s). This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/