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Non-Kondo-like Electronic Structure in the Correlated Rare-Earth Hexaboride

Author(s): Neupane, Madhab; Xu, Su-Yang; Alidoust, Nasser; Bian, Guang; Kim, DJ; et al

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Abstract: We present angle-resolved photoemission studies on the rare-earth hexaboride YbB6, which has recently been predicted to be a topological Kondo insulator. Our data do not agree with the prediction and instead show that YbB6 exhibits a novel topological insulator state in the absence of a Kondo mechanism. We find that the Fermi level electronic structure of YbB6 has three 2D Dirac cone like surface states enclosing the Kramers’ points, while the f-orbital which would be relevant for the Kondo mechanism is ∼ 1 eV below the Fermi level. Our first-principles calculation shows that the topological state which we observe in YbB6 is due to an inversion between Yb d and B p bands. These experimental and theoretical results provide a new approach for realizing novel correlated topological insulator states in rare-earth materials.
Publication Date: Jan-2015
Electronic Publication Date: 7-Jan-2015
Citation: Neupane, Madhab, Xu, Su-Yang, Alidoust, Nasser, Bian, Guang, Kim, DJ, Liu, Chang, Belopolski, I, Chang, T-R, Jeng, H-T, Durakiewicz, T, Lin, H, Bansil, A, Fisk, Z, Hasan, MZ. (2015). Non-Kondo-like Electronic Structure in the Correlated Rare-Earth Hexaboride. Physical Review Letters, 114 (1), 10.1103/PhysRevLett.114.016403
DOI: doi:10.1103/PhysRevLett.114.016403
ISSN: 0031-9007
EISSN: 1079-7114
Type of Material: Journal Article
Journal/Proceeding Title: Physical Review Letters
Version: Author's manuscript

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