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We have investigated temperature-dependent behaviors of electronic structureand resistivity in a mixed-valent golden phase of SmS, based on the dynamicalmean-field theory band structure calculations. Upon cooling, the coherent Sm4$f$ bands are formed to produce the hybridization induced pseudogap near theFermi level, and accordingly the topology of Fermi surface is changed toexhibit a Lifshitz-like transition. The surface states emerging in the bulk gapregion are found to be not topologically protected states but just typicalRashba spin-polarized states, indicating that SmS is not a topological Kondosemimetal. From the analysis of anomalous resistivity behavior in SmS, we haveidentified universal energy scales, which characterize the Kondo/mixed-valentsemimetallic systems.

Topological properties and the dynamical crossover from mixed-valence to Kondo-lattice behavior in golden phase of SmS