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• W2090392302 abstract "Samarium hexaboride (SmB$_6$) is the first strongly correlated material with a recognized non-trivial band-structure topology. Its electron correlations are seen by inelastic neutron scattering as a coherent collective excitation at the energy of 14 meV. Here we calculate the spectrum of this mode using a perturbative slave boson method. Our starting point is the recently constructed Anderson model that properly captures the band-structure topology of SmB$_6$. Most self-consistent renormalization effects are captured by a few phenomenological parameters whose values are fitted to match the calculated and experimentally measured mode spectrum in the first Brillouin zone. A simple band-structure of low-energy quasiparticles in SmB$_6$ is also modeled through this fitting procedure, because the important renormalization effects due to Coulomb interactions are hard to calculate by ab-initio methods. Despite involving uncontrolled approximations, the slave boson calculation is capable of producing a fairly good quantitative match of the energy spectrum, and a qualitative match of the spectral weight throughout the first Brillouin zone. We find that the fitted band-structure required for this match indeed puts SmB$_6$ in the class of strong topological insulators. Our analysis thus provides a detailed physical picture of how the SmB$_6$ band topology arises from strong electron interactions, and paints the collective mode as magnetically active exciton." @default.
• W2090392302 created "2016-06-24" @default.
• W2090392302 creator A5026496541 @default.
• W2090392302 creator A5074365665 @default.
• W2090392302 date "2014-11-24" @default.
• W2090392302 modified "2023-10-15" @default.
• W2090392302 title "In-gap collective mode spectrum of the topological Kondo insulatorSmB6" @default.
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• W2090392302 doi "https://doi.org/10.1103/physrevb.90.195144" @default.
• W2090392302 hasPublicationYear "2014" @default.
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