Photoinduced magnetic bound state in itinerant correlated electron system with spin-state degree of freedom
| Autor: | Kanamori, Yu, Ohara, Jun, Ishihara, Sumio |
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| Rok vydání: | 2012 |
| Předmět: | |
| Zdroj: | Phys. Rev. B 86, 045137 (2013) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevB.86.045137 |
| Popis: | 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. Comment: 15 pages, 16 figures |
| Databáze: | arXiv |
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