Non-Kondo-like Electronic Structure in the Correlated Rare-Earth Hexaboride YbB6

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, and M. Z. Hasan
Phys. Rev. Lett. 114, 016403 – Published 7 January 2015
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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.

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  • Received 17 May 2014

DOI:https://doi.org/10.1103/PhysRevLett.114.016403

© 2015 American Physical Society

Authors & Affiliations

Madhab Neupane1, Su-Yang Xu1, Nasser Alidoust1, Guang Bian1, D. J. Kim2, Chang Liu1, I. Belopolski1, T.-R. Chang3, H.-T. Jeng3,4, T. Durakiewicz5, H. Lin6, A. Bansil7, Z. Fisk2, and M. Z. Hasan1,8,*

  • 1Joseph Henry Laboratory and Department of Physics, Princeton University, Princeton, New Jersey 08544, USA
  • 2Department of Physics and Astronomy, University of California at Irvine, Irvine, California 92697, USA
  • 3Department of Physics, National Tsing Hua University, Hsinchu 30013, Taiwan
  • 4Institute of Physics, Academia Sinica, Taipei 11529, Taiwan
  • 5Condensed Matter and Magnet Science Group, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
  • 6Graphene Research Centre, Department of Physics, National University of Singapore, Singapore 117542, Singapore
  • 7Department of Physics, Northeastern University, Boston, Massachusetts 02115, USA
  • 8Princeton Center for Complex Materials, Princeton University, Princeton, New Jersey 08544, USA

  • *Corresponding author. mzhasan@princeton.edu

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Vol. 114, Iss. 1 — 9 January 2015

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