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Title: Interaction Driven Subgap Spin Exciton in the Kondo Insulator SmB6

In this paper, using inelastic neutron scattering, we map a 14 meV coherent resonant mode in the topological Kondo insulator SmB6 and describe its relation to the low energy insulating band structure. The resonant intensity is confined to the X and R high symmetry points, repeating outside the first Brillouin zone and dispersing less than 2 meV, with a 5d-like magnetic form factor. We present a slave-boson treatment of the Anderson Hamiltonian with a third neighbor dominated hybridized band structure. This approach produces a spin exciton below the charge gap with features that are consistent with the observed neutron scattering. Finally, we find that maxima in the wave vector dependence of the inelastic neutron scattering indicate band inversion.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [2] ;  [2] ;  [5] ;  [6] ;  [7] ;  [1] ;  [8] ;  [8] ;  [9] ;  [10] ;  [11]
  1. Johns Hopkins Univ., Baltimore, MD (United States). Inst. for Quantum Matter. Dept. of Physics and Astronomy
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division
  3. Johns Hopkins Univ., Baltimore, MD (United States). Inst. for Quantum Matter. Dept. of Physics and Astronomy; George Mason Univ., Fairfax, VA (United States). School of Physics, Astronomy and Computational Sciences
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Neutron Data Analysis and Visualization Division
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Instrument Source Division
  6. National Research Centre (NRC), Moscow (Russian Federation). Kurchatov Inst. (NRCKI); National Research Nuclear Univ. MEPhI, Moscow (Russian Federation)
  7. CEA Saclay, Gif sur Yvette (France). CEA-CNRS. Lab. Leon Brillouin
  8. Johns Hopkins Univ., Baltimore, MD (United States). Inst. for Quantum Matter. Dept. of Physics and Astronomy; Johns Hopkins Univ., Baltimore, MD (United States). Dept. of Chemistry
  9. Johns Hopkins Univ., Baltimore, MD (United States). Inst. for Quantum Matter. Dept. of Physics and Astronomy; Princeton Univ., NJ (United States). Dept. of Chemistry
  10. Johns Hopkins Univ., Baltimore, MD (United States). Inst. for Quantum Matter. Dept. of Physics and Astronomy; Johns Hopkins Univ., Baltimore, MD (United States). Dept. of Chemistry; Johns Hopkins Univ., Baltimore, MD (United States). Dept. of Materials Science and Engineering
  11. Johns Hopkins Univ., Baltimore, MD (United States). Inst. for Quantum Matter. Dept. of Physics and Astronomy; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division; Johns Hopkins Univ., Baltimore, MD (United States). Dept. of Materials Science and Engineering
Publication Date:
OSTI Identifier:
1286724
Grant/Contract Number:
AC05-00OR22725; FG02-08ER46544
Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 114; Journal Issue: 3; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Contributing Orgs:
Johns Hopkins Univ., Baltimore, MD (United States)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS