Non-Kondo-like electronic structure in the correlated rare-earth hexaboride YbB6

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.

doi:10.1103/PhysRevLett.114.016403

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

Journal Article · Wed Jan 07 00:00:00 EST 2015 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.114.016403· OSTI ID:1304823

Neupane, Madhab ^[1]; Xu, Su -Yang ^[1]; Alidoust, Nasser ^[1]; Bian, Guang ^[1]; Kim, D. J. ^[2]; Liu, Chang ^[1]; Belopolski, I. ^[1]; Chang, T. -R. ^[3]; Jeng, H. -T. ^[4]; Durakiewicz, T. ^[5]; Lin, H. ^[6]; Bansil, A. ^[7]; Fisk, Z. ^[2]; Hasan, M. Z. ^[1]

Princeton Univ., Princeton, NJ (United States)
Univ. of California, Irvine, CA (United States)
National Tsing Hua Univ., Hsinchu (Taiwan)
National Tsing Hua Univ., Hsinchu (Taiwan); Academia Sinica, Taipei (Taiwan)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
National Univ. of Singapore (Singapore)
Northeastern Univ., Boston, MA (United States)

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.

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Research Organization:: Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC52-06NA25396

OSTI ID:: 1304823

Alternate ID(s):: OSTI ID: 1181380

Report Number(s):: LA-UR-14-23024; PRLTAO

Journal Information:: Physical Review Letters, Vol. 114, Issue 1; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 44 works

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Pressure-induced exotic states in rare earth hexaborides Sun, Liling; Wu, Qi Reports on Progress in Physics, Vol. 79, Issue 8 https://doi.org/10.1088/0034-4885/79/8/084503	journal	July 2016
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