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Title: Non-Kondo-like electronic structure in the correlated rare-earth hexaboride Y b B 6

Abstract

Here, we present angle-resolved photoemission studies on the rare-earth-hexaboride YbB 6, which has recently been predicted to be a topological Kondo insulator. Our data do not agree with the prediction and instead show that YbB 6 exhibits a novel topological insulator state in the absence of a Kondo mechanism. We find that the Fermi level electronic structure of YbB 6 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 ~1 eV below the Fermi level. Our first-principles calculation shows that the topological state that we observe in YbB 6 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.

Authors:
 [1];  [1];  [1];  [1];  [2];  [1];  [1];  [3];  [4];  [5];  [6];  [7];  [2];  [1]
  1. Princeton Univ., Princeton, NJ (United States)
  2. Univ. of California, Irvine, CA (United States)
  3. National Tsing Hua Univ., Hsinchu (Taiwan)
  4. National Tsing Hua Univ., Hsinchu (Taiwan); Academia Sinica, Taipei (Taiwan)
  5. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  6. National Univ. of Singapore (Singapore)
  7. Northeastern Univ., Boston, MA (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1304823
Alternate Identifier(s):
OSTI ID: 1181380
Report Number(s):
LA-UR-14-23024
Journal ID: ISSN 0031-9007; PRLTAO
Grant/Contract Number:
AC52-06NA25396
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 114; Journal Issue: 1; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Neupane, Madhab, Xu, Su -Yang, Alidoust, Nasser, Bian, Guang, Kim, D. J., Liu, Chang, Belopolski, I., Chang, T. -R., Jeng, H. -T., Durakiewicz, T., Lin, H., Bansil, A., Fisk, Z., and Hasan, M. Z.. Non-Kondo-like electronic structure in the correlated rare-earth hexaboride YbB6. United States: N. p., 2015. Web. doi:10.1103/PhysRevLett.114.016403.
Neupane, Madhab, Xu, Su -Yang, Alidoust, Nasser, Bian, Guang, Kim, D. J., Liu, Chang, Belopolski, I., Chang, T. -R., Jeng, H. -T., Durakiewicz, T., Lin, H., Bansil, A., Fisk, Z., & Hasan, M. Z.. Non-Kondo-like electronic structure in the correlated rare-earth hexaboride YbB6. United States. doi:10.1103/PhysRevLett.114.016403.
Neupane, Madhab, Xu, Su -Yang, Alidoust, Nasser, Bian, Guang, Kim, D. J., Liu, Chang, Belopolski, I., Chang, T. -R., Jeng, H. -T., Durakiewicz, T., Lin, H., Bansil, A., Fisk, Z., and Hasan, M. Z.. Wed . "Non-Kondo-like electronic structure in the correlated rare-earth hexaboride YbB6". United States. doi:10.1103/PhysRevLett.114.016403. https://www.osti.gov/servlets/purl/1304823.
@article{osti_1304823,
title = {Non-Kondo-like electronic structure in the correlated rare-earth hexaboride YbB6},
author = {Neupane, Madhab and Xu, Su -Yang and Alidoust, Nasser and Bian, Guang and Kim, D. J. and Liu, Chang and Belopolski, I. and Chang, T. -R. and Jeng, H. -T. and Durakiewicz, T. and Lin, H. and Bansil, A. and Fisk, Z. and Hasan, M. Z.},
abstractNote = {Here, 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 ~1 eV 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.},
doi = {10.1103/PhysRevLett.114.016403},
journal = {Physical Review Letters},
number = 1,
volume = 114,
place = {United States},
year = {Wed Jan 07 00:00:00 EST 2015},
month = {Wed Jan 07 00:00:00 EST 2015}
}

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