Correct Brillouin zone and electronic structure of BiPd

Abstract

A promising route to the realization of Majorana fermions is in non-centrosymmetric superconductors, in which spin-orbit-coupling lifts the spin degeneracy of both bulk and surface bands. A detailed assessment of the electronic structure is critical to evaluate their suitability for this through establishing the topological properties of the electronic structure. This requires correct identification of the time-reversal-invariant momenta. One such material is BiPd, a recently rediscovered non-centrosymmetric superconductor which can be grown in large, high-quality single crystals and has been studied by several groups using angular resolved photoemission to establish its surface electronic structure. Many of the published electronic structure studies on this material are based on a reciprocal unit cell which is not the actual Brillouin zone of the material. We show here the consequences of this for the electronic structures and show how the inferred topological nature of the material is affected.

Originally a comment on 1505.03466/1610.03431 and 1609.08947. 4 pages plus an appendix with literature crystal structure refinements

References in corpus (10)

• Superconducting proximity effect and Majorana fermions at the surface of a topological insulator
• Weyl and Dirac Semimetals in Three Dimensional Solids
• Colloquium: Majorana Fermions in nuclear, particle and solid-state physics
• Electron Correlation and Pairing States in Superconductors without Inversion Symmetry
• Topological surface states in nodal superconductors
• Dirac Surface States and Nature of Superconductivity in Noncentrosymmetric BiPd
• Observation of Andreev bound state and multiple energy gaps in the non-centrosymmetric superconductor BiPd
• Observation of Dirac surface states in the noncentrosymmetric superconductor BiPd
• Unusual Dirac fermions on the surface of noncentrosymmetric $\alpha$ - BiPd superconductor
• Fermi surface and band structure of BiPd from ARPES studies

Cited by in corpus (5)

• Spin-triplet pairing state evidenced by half-quantum flux in a noncentrosymmetric superconductor
• Exceptional Dirac states in a non-centrosymmetric superconductor, BiPd
• Superconductivity in Bi based Bi2PdPt
• Kinetic stabilization of 1D surface states near twin boundaries in noncentrosymmetric BiPd
• Temperature dependence of the lower critical field of the noncentrosymmetric superconductor $\alpha$-BiPd