4.6 Article

Topological properties and self-energy effects in elemental Yb

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PHYSICAL REVIEW B
卷 104, 期 19, 页码 -

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AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.104.195138

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  1. Deutsche Forschungsgemeinschaft (DFG) through the Collaborative Research Center [C01]

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The study reveals the existence of Dirac nodal lines with pi Berry phase and related topological surface states in hexagonal close-packed Yb, an element of the lanthanide series, in the absence of spin-orbit coupling. These topological properties emerge after taking into account self-energy corrections, allowing for the correct description of the experimental low-energy electronic structure of Yb. The research also demonstrates the presence of robust topological surface states in Yb even in the presence of large spin-orbit coupling.
Recent theoretical calculations predict the presence of Dirac nodal lines with pi 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.

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