Non-Kondo-like electronic structure in the correlated rare-earth hexaboride Yb B6

Madhab Neupane, Su Yang Xu, Nasser Alidoust, Guang Bian, D. J. Kim, Chang Liu, I. Belopolski, T. R. Chang, H. T. Jeng, T. Durakiewicz, H. Lin, A. Bansil, Z. Fisk, M. Z. Hasan

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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's points, while the f orbital that would be relevant for the Kondo mechanism is ∼1eV below the Fermi level. Our first-principles calculation shows that the topological state that 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.

Original languageEnglish (US)
Article number016403
JournalPhysical review letters
Volume114
Issue number1
DOIs
StatePublished - Jul 7 2015

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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    Neupane, M., Xu, S. Y., Alidoust, N., Bian, G., Kim, D. J., Liu, C., Belopolski, I., Chang, T. R., Jeng, H. T., Durakiewicz, T., Lin, H., Bansil, A., Fisk, Z., & Hasan, M. Z. (2015). Non-Kondo-like electronic structure in the correlated rare-earth hexaboride Yb B6. Physical review letters, 114(1), [016403]. https://doi.org/10.1103/PhysRevLett.114.016403