Numerical Study of Photo-Induced Dynamics in Double-Exchange Model

Abstract

Photo-induced spin and charge dynamics in double-exchange model are numerically studied. The Lanczos method and the density-matrix renormalization-group method are applied to one-dimensional finite-size clusters. By photon irradiation in a charge ordered (CO) insulator associated with antiferromagnetic (AFM) correlation, both the CO and AFM correlations collapse rapidly, and appearances of new peaks inside of an insulating gap are observed in the optical spectra and the one-particle excitation spectra. Time evolutions of the spin correlation and the in-gap state are correlated with each other, and are governed by the transfer integral of conduction electrons. Results are interpreted by the charge kink/anti-kink picture and their effective motions which depend on the localized spin correlation. Pump-photon density dependence of spin and charge dynamics are also studied. Roles of spin degree of freedom are remarkable in a case of weak photon density. Implications of the numerical results for the pump-probe experiments in perovskite manganites are discussed.

16 pages, 16 figures

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• Ultrafast Photoinduced Formation of Metallic State in a Perovskite-type Manganite with Short Range Charge and Orbital Order
• Photoinduced charge and spin dynamics in strongly correlated electron systems
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• Thermalization after photoexcitation from the perspective of optical spectroscopy
• Optical manipulation of magnetism in spin-charge coupled correlated electron system
• Photoinduced magnetic bound state in itinerant correlated electron system with spin-state degree of freedom
• Photo-induced Ferromagnetic and Superconducting Orders in Multi-orbital Hubbard Models
• Photo-induced charge, spin, and orbital order in the two-orbital extended Hubbard model