Ultrafast carrier dynamics and terahertz conductivity of photoexcited GaAs under electric field

The ultrafast carrier dynamics and terahertz conductivity in semi-insulating GaAs have been investigated under electric field (E) by using optical pump-terahertz probe technique. The measurements indicate that the terahertz transmission change induced by the pump pulses at high E is smaller than tha...

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Bibliographic Details
Published in:Applied physics letters 2008-09, Vol.93 (10)
Main Authors: Zhou, Qing-li, Shi, Yulei, Jin, Bin, Zhang, Cunlin
Format: Article
Language:English
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Summary:The ultrafast carrier dynamics and terahertz conductivity in semi-insulating GaAs have been investigated under electric field (E) by using optical pump-terahertz probe technique. The measurements indicate that the terahertz transmission change induced by the pump pulses at high E is smaller than that without E. We attribute this phenomenon to carrier scattering into the L valley, which leads to a drop in carrier mobility. The calculated transient photoconductivities fit well with the Drude–Smith model, being consistent with our intervalley scattering model.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.2980026