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The European Physical Journal Special Topics

, Volume 222, Issue 5, pp 1125–1135 | Cite as

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

  • S. IshiharaEmail author
  • J. Ohara
  • Y. Kanamori
Regular Article Structural and Magnetic Transformations

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.

Keywords

European Physical Journal Special Topic Charge Order Correlate Electron System Perovskite Manganite Optical Impact 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© EDP Sciences and Springer 2013

Authors and Affiliations

  1. 1.Department of PhysicsTohoku UniversitySendaiJapan
  2. 2.CRESTSendaiJapan
  3. 3.Department of PhysicsHokkaido UniversitySapporoJapan

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