Polaronic features in the optical properties of the Holstein-t-J model

Abstract

We derive the exact solution for the optical conductivity $\sigma (\omega )$ of one hole in the Holstein-t-J model in the framework of dynamical mean-field theory (DMFT). We investigate the magnetic and phonon features associated with polaron formation as a function of the exchange coupling $J$, of the electron-phonon interaction $\lambda$ and of the temperature. Our solution directly relates the features of the optical conductivity to the excitations in the single-particle spectral function, revealing two distinct mechanisms of closing and filling of the optical pseudogap that take place upon varying the microscopic parameters. We show that the optical absorption at the polaron crossover is characterized by a coexistence of a magnon peak at low frequency and a broad polaronic band at higher frequency. An analytical expression for $\sigma (\omega )$ valid in the polaronic regime is presented.

improved version, as submitted to Phys. Rev. B

References in corpus (7)

• Polaronic behavior of undoped high-Tc cuprates
• Electron-phonon interaction in the t-J model
• Electron-phonon interaction and antiferromagnetic correlations
• Optical Conductivity of the t-J model within Cluster Dynamical Mean Field Theory
• Dispersion of incoherent spectral features in systems with strong electron-phonon coupling
• Numerical study of the isotope effect in underdoped high-temperature superconductors: Calculation of the angle-resolved photoemission spectra
• Electron-phonon coupling in the self-consistent Born approximation of the t-J model

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• Bipolaron in the t-J model coupled to longitudinal and transverse quantum lattice vibrations
• Optical and dc conductivities of cuprates: Spin-fluctuation scattering in the t-J model
• Optical conductivity in the t-J-Holstein Model
• Enhancement of phonon effects in photoexcited states of one-dimensional Mott insulators
• Optical Signature of a Crossover from Mott- to Slater-type Gap in Sr${}_2$Ir${}_{1-x}$Rh${}_x$O${}_4$
• Electronic transport in AlMn(Si) and AlCuFe quasicrystals: Break-down of the semiclassical model
• Dynamic Competition Between Hubbard and Superexchange Interactions Selectively Localizes Electrons and Holes Through Polarons
• Optical properties of the Holstein-t-J model from dynamical mean-field theory