Optical conductivity of polaronic charge carriers

Abstract

The optical conductivity of charge carriers coupled to quantum phonons is studied in the framework of the one-dimensional spinless Holstein model. For one electron, variational diagonalisation yields exact results in the thermodynamic limit, whereas at finite carrier density analytical approximations based on previous work on single-particle spectral functions are obtained. Particular emphasis is put on deviations from weak-coupling, small-polaron or one-electron theories occurring at intermediate coupling and/or finite carrier density. The analytical results are in surprisingly good agreement with exact data, and exhibit the characteristic polaronic excitations observed in experiments on manganites.

23 pages, 11 figures

References in corpus (7)

• The Kernel Polynomial Method
• Quantum lattice dynamical effects on the single-particle excitations in 1D Mott and Peierls insulators
• Photoemission spectra of many-polaron systems
• Optical absorption and activated transport in polaronic systems
• Spectral functions of the spinless Holstein model
• Phonon spectral function of the Holstein polaron
• Analytical approach to the quantum-phase transition in the one-dimensional spinless Holstein model

Cited by in corpus (5)

• Dynamic charge correlations near the Peierls transition
• Phase diagram of the Holstein polaron in one dimension
• Interplay of charge, spin and lattice degrees of freedom on the spectral properties of the one-dimensional Hubbard-Holstein model
• Lattice exciton-polaron problem by quantum Monte Carlo simulations
• Thermal and optical conductivity in the Holstein model at half filling and at finite temperature in the Luttinger-liquid and charge-density-wave regime