Spatially resolved ultrafast transport current in GaAs photoswitches
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Date
2010-06-28
Publication Type
Journal Article
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Abstract
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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published
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Journal / series
Volume
96 (26)
Pages / Article No.
261110
Publisher
American Institute of Physics
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Subject
Gallium arsenide; III-V semiconductors; Photoconducting switches; Photoconductivity; Photoemission; Solid-state plasma; Time of flight spectra
Organisational unit
03833 - Wegscheider, Werner / Wegscheider, Werner
Notes
Received 5 May 2010, Accepted 10 June 2010, Published online 1 July 2010.