Spin-orbital physics in the optical conductivity of quarter-filled manganites

Abstract

Using finite-temperature diagonalization we investigate the optical conductivity $\sigma (\omega )$ and spin-orbital dynamics in the CE phase of half-doped manganites. We find $\sigma (\omega )$ characterized by a broad spectrum with pronounced optical gap due to charge ordering induced by Coulomb and further neighbor Jahn-Teller interactions. With increasing temperature the conductivity shows a significant change over a wide energy range with a characteristic shift towards lower frequencies. In the low temperature CE phase we observe in-gap absorption due to combined orbiton-spin excitations.

arXiv comment4 pages, 5 figures

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Cited by in corpus (8)

• Von Neumann Entropy Spectra and Entangled Excitations in Spin-Orbital Models
• Doping dependence of spin and orbital correlations in layered manganites
• Domain-wall excitons and optical conductivity in one-dimensional Wigner lattices
• In-plane anisotropy of the electronic structure for the charge/orbital-ordered state in half-doped manganite with layered structure
• Fingerprints of spin-orbital polarons and of their disorder in the photoemission spectra of doped Mott insulators with orbital degeneracy
• Jahn-Teller distortions and the magnetic order in the perovskite manganites
• Magnetic and orbital correlations in a two-site molecule
• Strongly momentum-dependent screening dynamics in La${}_{0.5}$Sr${}_{1.5}$MnO${}_4$ observed with resonant inelastic x-ray scattering