Infrared conductivity of a one-dimensional charge-ordered state: quantum lattice effects

Abstract

The optical properties of the charge-ordering ($CO$) phase of the one-dimensional (1D) half-filled spinless Holstein model are derived at zero temperature within a well-known variational approach improved including second-order lattice fluctuations. Within the $CO$ phase, the static lattice distortions give rise to the optical interband gap, that broadens as the strength of the electron-phonon ($el-ph$) interaction increases. The lattice fluctuation effects induce a long subgap tail in the infrared conductivity and a wide band above the gap energy. The first term is due to the multi-phonon emission by the charge carriers, the second to the interband transitions accompanied by the multi-phonon scattering. The results show a good agreement with experimental spectra.

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References in corpus (7)

• Phase diagram of the one-dimensional Holstein model of spinless fermions
• Spectral properties of the 2D Holstein polaron
• Universal subgap optical conductivity in quasi-one-dimensional Peierls systems
• Quantum Monte Carlo study of the one-dimensional Holstein model of spinless fermions
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• Spectral properties and infrared absorption in manganites
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• Polaronic approach to strongly correlated electron system with strong electron-phonon interaction
• A study of cooperative breathing-mode in molecular chains
• Phase transition and phase diagram at a general filling in the spinless one-dimensional Holstein Model
• Ground state features and spectral properties of large polaron liquids from low to high charge densities