Phononic soft mode and strong electronic background behavior across the structural phase transition in the excitonic insulator Ta${}_2$NiSe${}_5$ (with Erratum)

Min-Jae Kim, Armin Schulz, Tomohiro Takayama +3

Ta${}_2$NiSe${}_5$ became one of the most investigated candidate materials for hosting an excitonic insulator ground state. Many studies describe the corresponding phase transition as…