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

Murakami Yuta
Murakami Yuta
Kaneko Tatsuya
Kaneko Tatsuya

Physical Review B, pp. 1951182020.

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Abstract:

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 f...More

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