Abstract
Paramagnetic heavy fermion insulators consist of fully occupied quasiparticle bands inherent to Fermi liquid theory. The gap emergence below a characteristic temperature is the ultimate sign of coherence for a many-body system, which in addition can induce a non-trivial band topology. Here, we demonstrate a simple and efficient method to compare a model study and an experimental result for heavy fermion insulators. The temperature dependence of the gap formation in both local moment and mixed valence regimes is captured within the dynamical mean field (DMFT) approximation to the periodic Anderson model (PAM). Using the topological coherence temperature as the scaling factor and choosing the input parameter set within the mixed valence regime, we can unambiguously link the theoretical energy scales to the experimental ones. As a particularly important result, we find improved consistency between the scaled DMFT density of states and the photoemission near-gap spectra of samarium hexaboride (SmB6).
Highlights
The interplay of topology and correlation effects has led to generalizations of the concept of topological insulators[1,2], namely to symmetry protected topological surface states (TSS)[3]
The aim of this paper is to present a new perspective on the comparison of theoretical and experimental density of states (DOS) of heavy fermion (HF) insulators
We focus on the dynamical emergence of the hybridization gap of topological HF insulators in units of the coherence temperature Tcoh
Summary
The interplay of topology and correlation effects has led to generalizations of the concept of topological insulators[1,2], namely to symmetry protected topological surface states (TSS)[3]. We focus on the dynamical emergence of the hybridization gap of topological HF insulators in units of the coherence temperature Tcoh. This scaling provides an effective way to convert the theoretical to the experimental energy scales. There is a certain freedom in defining the quantitative Tcoh depending on the respective physical properties[40,41,42] This is due to the nature of the crossover in PAM (See the Sec. I of the Supplementary Information). We analyzed the gap evolution and occupation numbers to extract the experimental results
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