Novel Excitation-Density Dependence in Strongly Spin-Charge Coupled System

• Authors: J. Ohara , Y. Kanamori , S. Ishihara
• Languages of publication: EN

Abstracts

EN

Photoinduced spin-charge dynamics in strongly correlated electron systems is studied based on an extended double-exchange model. Solving a time-dependent Schrödinger equation with the Lanczos method, we trace the process of photoinduced melting of an antiferromagnetic charge order and analyze the excitation-density dependence on that. In the case of low density photoexcitation, both charge and spin orders are melted by photocarrier doping. This is interpreted with a conventional double-exchange mechanism. In the case of high density photoexcitation, however, the charge order is melted. The antiferromagnetic spin order is transiently weakened but after turnoff of the photoirradiation it recovers. This phenomenon strikingly differs from the weak photoexcitation case.

Keywords

EN

71.30.+h; 71.10.-w; 78.47.J-; 78.20.Bh

Discipline

• 71.30.+h: Metal-insulator transitions and other electronic transitions
• 71.10.-w: Theories and models of many-electron systems
• 78.47.J-: Ultrafast spectroscopy (<1>(see also 42.65.Re Ultrafast processes; optical pulse generation and pulse compression; 82.53.Mj Femtosecond probing of semiconductor nanostructures)
• 78.20.Bh: Theory, models, and numerical simulation

• Journal: Acta Physica Polonica A
• Year: 2012
• Volume: 121
• Issue: 2
• Pages: 355-358

Dates

published

2012-02

Contributors

author

J. Ohara

• Department of Physics, Tohoku University, Sendai 980-8578, Japan
• Core Research for Evolutional Science and Technology (CREST), Sendai 980-8578, Japan

author

Y. Kanamori

• Department of Physics, Tohoku University, Sendai 980-8578, Japan

author

S. Ishihara

• Department of Physics, Tohoku University, Sendai 980-8578, Japan
• Core Research for Evolutional Science and Technology (CREST), Sendai 980-8578, Japan

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Identifiers

DOI

10.12693/APhysPolA.121.355