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- W2335811864 abstract "In nodal-line semimetals, which are among the classes of topological semimetals, the gap closes along loops in k space, which are not at high-symmetry points. Typical mechanisms for emergence of nodal lines are either from mirror symmetry or from topology, and the latter is achieved only in systems without spin-orbit interaction. with inversion and time-reversal symmetries. So far all the proposals of materials with nodal lines are protected from mirror symmetry. Here we show by ab initio calculations that fcc Ca, Sr, and Yb have topological nodal lines near the Fermi level when the spin-orbit interaction is neglected. These nodal lines do not originate from mirror symmetry, and are purely topological. The Berry phase along the surface normal becomes either {pi} or 0 depending on the momentum, and the {pi} Berry phase is attributed to polarization of the bulk states, and not the surface states as has been commonly believed. In Ca at high pressure, only the nodal lines at the Fermi level, and it is a nodal-line semimetal. In the materials having the nodal lines, both the large polarization e/2 and the emergent surface states enhances the Rashba splitting, as we show in Bi/Sr(111) and in the well-known giant Rashba system Bi/Ag(111)." @default.
- W2335811864 created "2016-06-24" @default.
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- W2335811864 date "2016-02-21" @default.
- W2335811864 modified "2023-09-27" @default.
- W2335811864 title "Topological Dirac Nodal Lines in fcc Calcium, Strontium, and Ytterbium" @default.
- W2335811864 hasPublicationYear "2016" @default.
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