2014/07/31 by Wesley Fuhrman, W. T. Fuhrman, J. Leiner +18 · 6 citations
Earth and Planetary Sciences · Physics and Astronomy · #Atomic physics #Brillouin zone #Condensed matter physics #Electron #Exciton #Hamiltonian (control theory) #High-pressure geophysics and materials #Inelastic neutron scattering #Inelastic scattering #Kondo effect #Kondo insulator #Neutron #Physics #Quantum mechanics #Rare-earth and actinide compounds #Scattering #Topological Materials and Phenomena #cond-mat.str-el
paper · pdf · doi:10.1103/physrevlett.114.036401
openalex publication_date 2015/01/21 · arxiv created 2015/01/30 · arxiv updated 2015/02/12 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
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. We find that maxima in the wave vector dependence of the inelastic neutron scattering indicate band inversion.