Spin-orbit interaction and Dirac cones in d-orbital noble metal surface states

Ryan Requist*, Polina M. Sheverdyaeva, Paolo Moras, Sanjoy K. Mahatha, Carlo Carbone, Erio Tosatti

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

22 Scopus citations


Band splittings, chiral spin polarization, and topological surface states generated by spin-orbit interactions at crystal surfaces are receiving a lot of attention for their potential device applications as well as fascinating physical properties. Most studies have focused on sp states near the Fermi energy, which are relevant for transport and have long lifetimes. Far less explored, though in principle stronger, are spin-orbit interaction effects within d states, including those deep below the Fermi energy. Here, we report a joint photoemission and ab initio study of spin-orbit effects in the deep d-orbital surface states of a 24-layer Au film grown on Ag(111) and a 24-layer Ag film grown on Au(111), singling out a conical intersection (Dirac cone) between two surface states in a large surface-projected gap at the time-reversal symmetric M¯ points. Unlike the often isotropic dispersion at Γ¯ point Dirac cones, the M¯ point cones are strongly anisotropic. An effective k·p Hamiltonian is derived to describe the anisotropic band splitting and spin polarization near the Dirac cone.

Original languageAmerican English
Article number045432
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number4
StatePublished - 28 Jan 2015
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2015 American Physical Society


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