Collective Modes in Excitonic Insulators: Effects of Electron-Phonon Coupling and Signatures in Optical Response

25 Mar 2020 Murakami Yuta Golež Denis Kaneko Tatsuya Koga Akihisa Millis Andrew J. Werner Philipp

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 Ta$_2$NiSe$_5$. 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... (read more)

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  • STRONGLY CORRELATED ELECTRONS
  • MESOSCALE AND NANOSCALE PHYSICS