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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
