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

Abstract

We have investigated temperature-dependent behaviors of electronic structure and resistivity in a mixed-valent golden phase of SmS, based on the dynamical mean-field theory band structure calculations. Upon cooling, the coherent Sm 4$f$ bands are formed to produce the hybridization induced pseudogap near the Fermi level, and accordingly the topology of Fermi surface is changed to exhibit a Lifshitz-like transition. The surface states emerging in the bulk gap region are found to be not topologically protected states but just typical Rashba spin-polarized states, indicating that SmS is not a topological Kondo semimetal. From the analysis of anomalous resistivity behavior in SmS, we have identified universal energy scales, which characterize the Kondo/mixed-valent semimetallic systems.

arXiv comment5 + 5 pages, 3 + 4 figures

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• Multiple topological Dirac cones in a mixed-valent Kondo semimetal: g-SmS
• Universal properties of the near-gap spectra of SmB6: dynamical mean-field calculations and photoemission experiments
• Interplay of Valence and Semimetal-to-Insulator Transitions in SmS
• Hard and soft x-ray photoemission spectroscopy study of the new Kondo system SmO thin film
• Pressure induced electronic transitions in Samarium monochalcogenides
• Large ferromagnetic-like band splitting in ultrathin ${\mathrm{SmC}}_6$ films
• Mini Volume Collapse as Evidence for a 3-Body Magnetic Polaron in $S{m}_{1-x}E{u}_{x}S$
• Anomalous 4$f$ fine structure in TmSe${}_{1-x}$Te${}_x$ across the metal-insulator transition