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- W1631569001 abstract "We report high-resolution angle-resolved photoemission spectroscopy measurements on the honeycomb iridate ${mathrm{Na}}_{2}{mathrm{IrO}}_{3}$. Our measurements reveal the existence of a metallic surface band feature crossing the Fermi level with nearly linear dispersion and an estimated surface carrier density of $3.2ifmmodetimeselsetexttimesfi{}{10}^{13}phantom{rule{4pt}{0ex}}{mathrm{cm}}^{ensuremath{-}2}$, which has not been theoretically predicted or experimentally observed, and provides the first evidence for metallic behavior on the boundary of this material, whereas the bulk bands exhibit a robust insulating gap. We further show the lack of theoretically predicted Dirac cones at the $overline{M}$ points of the surface Brillouin zone, which confirms the absence of a stacked quantum spin Hall phase in this material. Our data indicates that the surface ground state of this material is exotic and metallic, unlike as predicted in theory, and establishes ${mathrm{Na}}_{2}{mathrm{IrO}}_{3}$ as a rare example of a strongly correlated spin-orbit insulator with surface metallicity." @default.
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- W1631569001 date "2016-06-14" @default.
- W1631569001 modified "2023-10-14" @default.
- W1631569001 title "Observation of metallic surface states in the strongly correlated Kitaev-Heisenberg candidateNa2IrO3" @default.
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- W1631569001 doi "https://doi.org/10.1103/physrevb.93.245132" @default.
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