Optical conductivity in the t-J-Holstein Model

Abstract

Using recently developed numerical method we compute charge stiffness and optical conductivity of the t-J model coupled to optical phonons. Coherent hole motion is most strongly influenced by the electron-phonon coupling within the physically relevant regime of the exchange interaction. We find unusual non-monotonous dependence of the charge stiffness as a function of the exchange coupling near the crossover to the strong electron-phonon coupling regime. Optical conductivity in this regime shows a two-peak structure. The low-frequency peak represents local magnetic excitation, attached to the hole, while the higher-frequency peak corresponds to the mid infrared band that originates from coupling to spin-wave excitations, broadened and renormalized by phonon excitations. We observe no separate peak at or slightly above the phonon frequency. This finding suggests that the two peak structure seen in recent optical measurements is due to magnetic excitations coupled to lattice degrees of freedom via doped charge carriers.

6 pages, 5 figures, submitted to PRB

References in corpus (15)

• Saturation of electrical resistivity
• The Holstein Polaron
• Polaronic behavior of undoped high-Tc cuprates
• Doping dependence of the coupling of electrons to bosonic modes in the single-layer high-temperature Bi2Sr2CuO6 superconductor
• Charge dynamics of doped holes in high Tc cuprates - A clue from optical conductivity
• Optical absorption and single-particle excitations in the 2D Holstein t-J model
• Optical conductivity of the Frohlich polaron
• Numerical approach to low-doping regime of the t-J model
• Electronic States in the Antiferromagnetic Phase of Electron-Doped High-Tc Cuprates
• Dynamical Properties of a Single Hole in an Antiferromagnet
• Boson-controlled quantum transport
• Optical absorption and activated transport in polaronic systems
• Polaronic features in the optical properties of the Holstein-t-J model
• Self-localization of composite spin-lattice polarons
• Resistivity and optical conductivity of cuprates within the t-J model

Cited by in corpus (8)

• Quantum Dynamics of the Hubbard-Holstein Model in Equilibrium and Non-Equilibrium: Application to Pump-Probe Phenomena
• Intermediate Coupling Model of the Cuprates
• Optical model-solution to the competition between a pseudogap phase and a Mott-gap phase in high-temperature cuprate superconductors
• Quantum Dynamics of a Driven Correlated System Coupled to Phonons
• Dielectric breakdown of Mott insulators -- doublon production and doublon heating
• Optical conductivity of doped Mott insulator: the interplay between correlation and electron-phonon interaction
• Optical and dc conductivities of cuprates: Spin-fluctuation scattering in the t-J model
• Low-energy photoexcitations inside the Mott gap in doped Hubbard and t-J ladders