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Collective modes in excitonic insulators: Effects of electron-phonon coupling and signatures in the optical response

Murakami, Yuta ; Golež, Denis ; Kaneko, Tatsuya ; Koga, Akihisa ; Millis, Andrew J. ; Werner, Philipp

In: Physical Review B, 2020, vol. 101, no. 19, p. 195118

We consider a two-band spinless model describing an excitonic insulator (EI) on the two-dimensional square lattice with anisotropic hopping parameters and electron-phonon (el-ph) coupling, inspired by the EI candidate Ta2NiSe5. We systematically study the nature of the collective excitations in the ordered phase which originates from the interband Coulomb interaction and the el-ph coupling. ...

Satellites and large doping and temperature dependence of electronic properties in hole-doped BaFe₂As₂

Werner, Philipp ; Casula, Michele ; Miyake, Takashi ; Aryasetiawan, Ferdi ; Millis, Andrew J. ; Biermann, Silke

In: Nature Physics, 2012, vol. 8, p. 331–337