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


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.


European Physical Journal Special Topic Charge Order Correlate Electron System Perovskite Manganite Optical Impact 
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© 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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