Photoinduced charge and spin dynamics in strongly correlated electron systems

TL;DR

This study investigates how photoirradiation affects charge and spin dynamics in strongly correlated electron systems, revealing transient metallic states and recovery behaviors consistent with experimental observations.

Contribution

It provides the first detailed DMRG analysis of photoinduced charge and spin dynamics in the extended double-exchange model.

Findings

Photoirradiation induces a transient metallic state from a charge-ordered insulator.

Recovery of the initial state involves suppression of antiferromagnetic correlations.

Results align with recent pump-probe spectroscopy experiments.

Abstract

Motivated by photoinduced phase transition in manganese oxides, charge and spin dynamics induced by photoirradiation are examined. We calculate the transient optical absorption spectra of the extended double-exchange model by the density matrix renormalization group (DMRG) method. A charge-ordered insulating (COI) state becomes metallic just after photoirradiation, and the system tends to recover the initial COI state. The recovery is accompanied with remarkable suppression of an antiferromagnetic correlation in the COI state. The DMRG results are consistent with recent pump-probe spectroscopy data.