Soliton-induced optical absorption of halogen-bridged mixed-valence binuclear metal complexes

TL;DR

This paper investigates the optical absorption caused by solitons in halogen-bridged binuclear metal complexes using a theoretical model, revealing unique spectral features distinct from mononuclear analogs.

Contribution

It introduces a theoretical analysis of soliton-induced optical absorption in MMX complexes, highlighting the effects of broken electron-hole symmetry and interactions.

Findings

Soliton absorption spectra in MMX chains can split into two bands.

Distinct spectral features contrast with those of mononuclear metal analogs.

Broken electron-hole symmetry influences optical properties.

Abstract

Employing the one-dimensional single-band extended Peierls-Hubbard model, we investigate optical conductivity for solitonic excitations in halogen-bridged binuclear metal (MMX) complexes. Photoinduced soliton absorption spectra for MMX chains possibly split into two bands, forming a striking contrast to those for conventional mononuclear metal (MX) analogs, due to the broken electron-hole symmetry combined with relevant Coulomb and/or electron-phonon interactions.