Spatially resolved ultrafast transport current in GaAs photoswitches

Prechtel, L.; Manus, S.; Schuh, D.; Wegscheider, W.; Holleitner, A. W.
June 2010
Applied Physics Letters;6/28/2010, Vol. 96 Issue 26, p261110
Academic Journal
We apply a pump- and probe-scheme to coplanar stripline circuits to investigate the photocurrent response of GaAs photoswitches in time and space. We find a displacement current pulse, as reported earlier. We interpret a time-delayed second pulse as a transport current. In a time-of-flight analysis we determine the velocity of the photogenerated charge carriers in the transport current. It exceeds the Fermi and the single-particle quantum velocities. This suggests that the excitation of an electron-hole plasma and not single charge-carriers dominates the ultrafast transport current in GaAs photoswitches.


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