Experimental and theoretical investigation of the drift velocity and velocity distribution function in GaAs/AlGaAs heterostructures

C. Wirner, M. Witzany, C. Kiener, G. Zandler, G. Bohm, E. Gornik, P. Vogl, G. Weimann

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3 Scopus citations

Abstract

The authors have investigated the temperature dependence and electron concentration dependence of the drift velocity in AlGaAs/GaAs heterostructures for electric fields up to 2 kV cm-1. The saturation behaviour of the drift velocity at different temperatures could be well described by assuming LO-phonon emission as well as intersubband scattering processes. An increase of the saturation drift velocity with increasing electron concentration was found which can be explained by screening effects. All experimental data were compared with theoretical calculations based on a Boltzmann integral as well as a balance equation method. In addition, the electron distribution function was measured directly using the Smith-Purcell effect. The authors observed a clear cut-off of the distribution function at the LO-phonon energy and a shift to higher velocity values with increasing applied electric field. Distinct deviations of the emission spectra from a drifted hot Fermi distribution were found.

Original languageEnglish
Article number065
Pages (from-to)B267-B270
JournalSemiconductor Science and Technology
Volume7
Issue number3 B
DOIs
StatePublished - 1992
Externally publishedYes

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