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Proceedings Paper

Diffusion-controlled picosecond carrier dynamics in ErAS:GaAs superlattice
Author(s): Martin Griebel; Jurgen H. Smet; Juergen Kuhl; Dan Driscoll; Christoph Kadow; Klaus von Klitzing; Arthur C. Gossard
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Paper Abstract

Equidistant layers of self-assembled ErAs islands embedded in a GaAs matrix are a promising alternative to low-temperature-grown (LTG) GaAs for the fabrication of ultrafast photoconductive switches. Unlike in LTG-GaAs, the electronic properties of this new material can be engineered straightforwardly by varying the period of the ErAs island superlattice. The carrier dynamics in MBE grown ErAs:GaAs has been investigated using photo-current autocorrelation measurements on a single photoconductive switch as a function of the superlattice period L. The electron lifetime can be tuned from 10.6 ps down to 2.3 ps by varying L between 300 and 100 nm. The dependence of the electron lifetime on L is understood in terms of a diffusion model. Two such switches were incorporated in a coplanar waveguide and illuminated by short laser pulses transferred to the switches via single-mode fibers. This setup enables pulse generation, propagation and detection under cryogenic conditions and high magnetic fields. By compensating fiber dispersion, a time resolution of less than 3 ps was achieved, limited only by the waveguide dispersion. This setup is ideally suited for time domain characterization with ultrahigh resolution of mesoscopic devices integrated on the same wafer.

Paper Details

Date Published: 11 June 2002
PDF: 6 pages
Proc. SPIE 4643, Ultrafast Phenomena in Semiconductors VI, (11 June 2002); doi: 10.1117/12.470436
Show Author Affiliations
Martin Griebel, Max-Planck-Institut fuer Festkoerperforschung (Germany)
Jurgen H. Smet, Max-Planck-Institut fuer Festkoerperforschung (Germany)
Juergen Kuhl, Max-Planck-Institut fuer Festkoerperforschung (Germany)
Dan Driscoll, Univ. of California/Santa Barbara (United States)
Christoph Kadow, Univ. of California/Santa Barbara (United States)
Klaus von Klitzing, Max-Planck-Institut fuer Festkoerperforschung (Germany)
Arthur C. Gossard, Univ. of California/Santa Barbara (United States)

Published in SPIE Proceedings Vol. 4643:
Ultrafast Phenomena in Semiconductors VI
Kong-Thon F. Tsen; Jin-Joo Song; Hongxing Jiang, Editor(s)

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