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Photoinduced phenomena in correlated electron systems with multi-degrees of freedom

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  • Structural and Magnetic Transformations
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Abstract

Photo-induced electronic dynamics in strongly correlated electron system with spin-charge coupling are studied. Motivated from recent optical pump-probe experiments in perovskite manganites and cobaltites, the double-exchange system and the spin-state transition system are theoretically analyzed. First, we focus on the double-exchange interaction in photo-excited state. The time evolutions for the spin and charge structures are examined as functions of the pump photon amplitudes. In the weak-pumping case, the initial charge-ordered antiferromagnetic insulating state tends to become the ferromagnetic metallic state. On the other hand, in the strong-pumping case, the initial antiferromagnetic correlation and insulating character are enhanced after photoirradiation. This unexpected photo-excited state is detectable by the ultrafast optical measurement. Second, in the spin-state transition system, the two-band Hubbard model is analyzed by the time-dependent mean-field approximation. By introducing photons in the low-spin band insulator, high-spin states are generated through the electron-hole pair annihilation process which is governed by the electron band width. We also take into account the relativistic spin-orbit interaction, and compare the results with and without the spin-orbit interaction.

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Authors and Affiliations

  1. Department of Physics, Tohoku University, Sendai, 980-8578, Japan

    S. Ishihara & Y. Kanamori

  2. CREST, Sendai, 980-8578, Japan

    S. Ishihara

  3. Department of Physics, Hokkaido University, Sapporo, 060-0810, Japan

    J. Ohara

Authors
  1. S. Ishihara
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  2. J. Ohara
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  3. Y. Kanamori
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Correspondence to S. Ishihara.

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Ishihara, S., Ohara, J. & Kanamori, Y. Photoinduced phenomena in correlated electron systems with multi-degrees of freedom. Eur. Phys. J. Spec. Top. 222, 1125–1135 (2013). https://doi.org/10.1140/epjst/e2013-01910-4

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  • DOI: https://doi.org/10.1140/epjst/e2013-01910-4

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