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Samarium hexaboride (SmB6) has been presumed to show a topological Kondoinsulating state consisting of fully occupied quasiparticle bands in theconcept of a Fermi liquid. This gap emerging below a small coherencetemperature is the ultimate sign of coherence for a many-body system, which inaddition induces a non-trivial topology. Here, we demonstrate that just oneenergy scale governs the gap formation in SmB6, which supports the Fermi liquiddescription. The temperature dependence of the gap formation in the mixedvalence regime is captured within the dynamical mean field (DMFT) approximationto the periodic Anderson model (PAM). The scaling property of the model withthe topological coherence temperature provides a strong connection to thephotoemission spectra of SmB6. Our results suggest a simple way to compare amodel study and an experiment result for heavy fermion insulators.

Universal properties of the near-gap spectra of SmB6: dynamical mean-field calculations and photoemission experiments