Giant exciton Fano resonance in quasi-one-dimensional Ta${}_2$NiSe${}_5$

T. I. Larkin, A. N. Yaresko, D. Pröpper +8

We report the complex dielectric function of the quasi-one-dimensional chalcogenide Ta${}_2$NiSe${}_5$, which exhibits a structural phase transition that has been attributed to exciton…