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Träfflista för sökning "WFRF:(Kempen K. P.) srt2:(2001-2004)"

Search: WFRF:(Kempen K. P.) > (2001-2004)

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1.
  • Kemerink, Martijn, et al. (author)
  • Optical detection of ballistically injected electrons in III/V heterostructures
  • 2001
  • In: Applied Physics A. - : Springer Verlag (Germany). - 0947-8396 .- 1432-0630. ; 72, s. S201-S204
  • Journal article (peer-reviewed)abstract
    • We present a novel spectroscopic technique that is based on the ballistic injection of minority carriers from the tip of a scanning-tunneling microscope into a semiconductor heterostructure. By analyzing the resulting electro-luminescence spectrum as a function of tip-sample bias, both the injection barrier height and the carrier relaxation rate Gamma(s) after injection can be determined. At 4.2 K we found Gamma(s) = 5 x 10(13) s(-1) and at 77 K we found Gamma(s) = 8 x 10(13) s(-1). From current-dependent measurements we find that, at room temperature, a large fraction of the carriers is trapped prior to radiative recombination. At high currents or low temperatures the traps become saturated. We tentatively identify the Be acceptors in the structure as trapping centers.
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2.
  • Kemerink, Martijn, et al. (author)
  • Optical properties of a tip-induced quantum dot
  • 2001
  • In: Applied Physics A. - : Springer Verlag (Germany). - 0947-8396 .- 1432-0630. ; 72, s. S239-S242
  • Journal article (peer-reviewed)abstract
    • We have performed optical spectroscopy measurements on a STM-tip-induced quantum dot in a GaAs layer. The dominant confinement in the (hole) quantum dot is found to be in the direction parallel to the tip axis. Electron confinement is achieved by a sub-surface AlGaAs barrier. Current-dependent measurements indicate that many-body interactions can cause spectral blueshifts up to 75 meV for a tunneling current of 10 nA. Consequently, a full treatment of the many-body problem is required for an accurate description of this type of system.
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  • Result 1-2 of 2
Type of publication
journal article (2)
Type of content
peer-reviewed (2)
Author/Editor
Kemerink, Martijn (2)
Koenraad, P.M. (2)
Sauthoff, K (2)
van Kempen, H (2)
Gerritsen, J. W. (2)
Wolter, J. H. (2)
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Devreese, J. T. (1)
Fomin, V. M. (1)
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University
Linköping University (2)
Language
English (2)
Research subject (UKÄ/SCB)
Natural sciences (2)
Year
2001 (2)

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