Dependence of femtosecond time-resolved magneto-optical Kerr rotation on the direction of polarization of the probe beam |
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Authors: | FENG XiaoBo LI Yan QIN Yi XIAO YunFeng YANG Hong & GONG QiHuang State Key Laboratory for Mesoscopic Physics |
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Affiliation: | FENG XiaoBo,LI Yan,QIN Yi,XIAO YunFeng,YANG Hong & GONG QiHuang State Key Laboratory for Mesoscopic Physics and Department of Physics,Peking University,Beijing 100871,China |
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Abstract: | We demonstrate that the femtosecond time-resolved magneto-optical Kerr rotation oscillates with the direction of polarization of the probe beam when a sample of Al0.25Ga0.75As/GaAs multi-quantum wells is excited by a circularly polarized pump and detected by a linearly polarized probe at wavelengths from 800 to 830 nm. Analytical expressions are derived to explain the mechanism, which is in good agreement with the numerical computation and the experimental data. The results suggest that the Kerr signal can ... |
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Keywords: | time-resolved Kerr rotation spin dynamics direction of polarization |
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