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Spatially resolved ultrafast transport current in GaAs photoswitches

Source: Appl. Phys. Lett. 96, 261110 (2010); doi:10.1063/1.3458819

Published 1 July 2010

KEYWORDS and PACS
Keywords
PACS
  • 85.60.-q
    Optoelectronic devices
  • YEAR: 2010
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PUBLICATION DATA
ISSN:
1553-9601 (online)
Publisher:
AIP is a member of CrossRef AIP
L. Prechtel,1 S. Manus,2 D. Schuh,3 W. Wegscheider,4 and A. W. Holleitner1
1Walter-Schottky Institut and Physik-Department, Technische Universität München, Am Coulombwall 3, 85748 Garching, Germany
2Fakultät für Physik, Center for NanoScience (CeNS), Ludwig-Maximilians-Universität, Geschwister-Scholl-Platz 1, D-80539 München, Germany
3Institut für Experimentelle und Angewandte Physik, Universität Regensburg, D-93040 Regensburg, Germany
4Solid State Physics Laboratory, ETH Zurich, 8093 Zurich, Switzerland
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. ©2010 American Institute of Physics
History: Received 5 May 2010; accepted 10 June 2010; published 1 July 2010
Permalink: http://link.aip.org/link/?APPLAB/96/261110/1

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