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

Qing-li Zhou; Yulei Shi; Bin Jin; Cunlin Zhang
September 2008
Applied Physics Letters;9/8/2008, Vol. 93 Issue 10, p102103
Academic Journal
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.


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