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

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.
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:
OSTI Identifier:
1304823
Report Number(s):
LA-UR--14-23024
Journal ID: ISSN 0031-9007; PRLTAO
Grant/Contract Number:
AC52-06NA25396
Type:
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)
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)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY