Photoinduced magnetic bound state in itinerant correlated electron system with spin-state degree of freedom

Abstract

Photo-excited state in correlated electron system with spin-state degree of freedom is studied. We start from the two-orbital extended Hubbard model where energy difference between the two orbitals is introduced. Photo-excited metastable state is examined based on the effective model Hamiltonian derived by the two-orbital Hubbard model. Spin-state change is induced by photo-irradiation in the low-spin band insulator near the phase boundary. High-spin state is stabilized by creating a ferromagnetic bound state with photo-doped hole carriers. An optical absorption occurs between the bonding and antibonding orbitals inside of the bound state. Time-evolution for photo-excited states is simulated in the time-dependent mean-field scheme. Pair-annihilations of the photo-doped electron and hole generate the high-spin state in a low-spin band insulator. We propose that this process is directly observed by the time-resolved photoemission experiments.

15 pages, 16 figures

References in corpus (5)

• Simple Two-Dimensional Model for the Elastic Origin of Cooperativity among Spin States of Spin-Crossover Complexes
• Phase separation in doped systems with spin-state transitions
• Photo-induced spin-state change in itinerant correlated-electron system
• Photoinduced charge and spin dynamics in strongly correlated electron systems
• Numerical Study of Photo-Induced Dynamics in Double-Exchange Model

Cited by in corpus (7)

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• Photoinduced Hund excitons in the breakdown of a two-orbital Mott insulator
• Strong enhancement of magnetic susceptibility induced by spin-nematic fluctuations in an excitonic insulating system with spin-orbit coupling
• Effects of magnetic fields and orbital angular momentum on excitonic condensation in two-orbital Hubbard model
• Nonequilibrium dynamics of multiorbital correlated electron system under time-dependent electric fields