Recent theoretical calculations predict the presence of Dirac nodal lines with π Berry phase and related topological surface states in elemental alkaline-earth metals. Here we provide experimental and theoretical evidence for the existence of similar nodal lines also in hexagonal close-packed Yb, an element of the lanthanide series, in the limit of zero spin-orbit coupling. These topological properties emerge after taking into account self-energy corrections, which permit one to correctly describe the experimental low-energy electronic structure of Yb. By angle-resolved photoemission spectroscopy we demonstrate the occurrence of topological surface states in Yb which are robust in the presence of the large spin-orbit coupling.

Sheverdyaeva, P.M., Offi, F., Gardonio, S., Novinec, L., Trioni, M.I., Ceresoli, D., et al. (2021). Topological properties and self-energy effects in elemental Yb. PHYSICAL REVIEW. B, 104, 195138 [10.1103/PhysRevB.104.195138].

Topological properties and self-energy effects in elemental Yb

F. Offi;S. Iacobucci;A. Ruocco;G. Stefani;
2021

Abstract

Recent theoretical calculations predict the presence of Dirac nodal lines with π Berry phase and related topological surface states in elemental alkaline-earth metals. Here we provide experimental and theoretical evidence for the existence of similar nodal lines also in hexagonal close-packed Yb, an element of the lanthanide series, in the limit of zero spin-orbit coupling. These topological properties emerge after taking into account self-energy corrections, which permit one to correctly describe the experimental low-energy electronic structure of Yb. By angle-resolved photoemission spectroscopy we demonstrate the occurrence of topological surface states in Yb which are robust in the presence of the large spin-orbit coupling.
Sheverdyaeva, P.M., Offi, F., Gardonio, S., Novinec, L., Trioni, M.I., Ceresoli, D., et al. (2021). Topological properties and self-energy effects in elemental Yb. PHYSICAL REVIEW. B, 104, 195138 [10.1103/PhysRevB.104.195138].
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11590/394689
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