TY - JOUR
T1 - Double-Exchange Interaction in Optically Induced Nonequilibrium State
T2 - A Conversion from Ferromagnetic to Antiferromagnetic Structure
AU - Ono, Atsushi
AU - Ishihara, Sumio
N1 - Funding Information:
The authors would like to thank S. Iwai, M. Naka, H. Nakao, T. Arima, and A. Fujimori for fruitful discussions. This work was supported by MEXT KAKENHI, Grants No. 26287070, No. 15H02100, and No. 17H02916. Some of the numerical calculations were performed using the facilities of the Supercomputer Center, the Institute for Solid State Physics, the University of Tokyo.
Publisher Copyright:
© 2017 American Physical Society.
PY - 2017/11/16
Y1 - 2017/11/16
N2 - The double-exchange (DE) interaction, that is, a ferromagnetic (FM) interaction due to a combination of electron motion and the Hund coupling, is a well-known source of a wide class of FM orders. Here, we show that the DE interaction in highly photoexcited states is antiferromagnetic (AFM). Transient dynamics of quantum electrons coupled with classical spins are analyzed. An ac field applied to a metallic FM state results in an almost perfect Néel state. A time characterizing the FM-to-AFM conversion is scaled by light amplitude and frequency. This hidden AFM interaction is attributable to the electron-spin coupling under nonequilibrium electron distribution.
AB - The double-exchange (DE) interaction, that is, a ferromagnetic (FM) interaction due to a combination of electron motion and the Hund coupling, is a well-known source of a wide class of FM orders. Here, we show that the DE interaction in highly photoexcited states is antiferromagnetic (AFM). Transient dynamics of quantum electrons coupled with classical spins are analyzed. An ac field applied to a metallic FM state results in an almost perfect Néel state. A time characterizing the FM-to-AFM conversion is scaled by light amplitude and frequency. This hidden AFM interaction is attributable to the electron-spin coupling under nonequilibrium electron distribution.
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U2 - 10.1103/PhysRevLett.119.207202
DO - 10.1103/PhysRevLett.119.207202
M3 - Article
C2 - 29219363
AN - SCOPUS:85034665687
SN - 0031-9007
VL - 119
JO - Physical Review Letters
JF - Physical Review Letters
IS - 20
M1 - 207202
ER -