A theoretical approach including multi-subband coupling is applied to electron transport in quasitwo-dimensional systems. This results in a modified contribution of the several scattering mechanisms to the total scattering rate. Taking into account the dominant scattering mechanisms the low-temperature mobility is calculated in the electric quantum limit and is compared with experimental data for heterojnnckions and single quantum wells (particularly consisting of Gal -*. AI,As/GaAs).Ein theoretisches Konzept mit verbesserter Einbeziehung der Rlultisubbandkopplung wird auf den Elektronentransport in quasizweidimensionalen Systemen angewandt. Dies fiihrt zu einem verhinderten Beitrag der einzelnen Streumechanismen zur Gesamtstreurate. Die Tiefternperaturbeweglichkeit wird fur einfache Potentialtopfe und Heteroiibergilnge (speziell aus Gal -%.-AI,As/GaAs) im ,,electric quantum limit " unter Einbeziehung der dominanten Streumechanismen berechnet und mit experimentellen Dnten verglichen.
The temperature and electron concentration dependence of the electron mobility is calculated for single quantum wells considering two occupied electron subbands. The results for the different scattering mechanisms and their interplay in the total mobility are changed with respect to those of other theoretical approaches which neglect multisubband coupling. The influence of the intersubband scattering is analyzed and the results are in agreement with experimental data.Unter der Beriicksichtigung der Besetzung von zwei elektronischen Subbandern wird die Temperatur-und Konzentrationsabhangigkeit der Elektronenbeweglichkeit fur einfache PotentialgrSben berechnet. Die Ergebnisse fur die verschiedenen Streumechanismen und ihr Zusammenwirken in der totalen Beweglichkeit unterscheiden sich von denen anderer theoretischer Zugange, welche die Multisubbandkopplung vernachlassigen. Der EinfluIl der Intersubbandstreuung wird analysiert, wobei die Ergebnisse mit experimentellen Daten gut iibereinstimmen.
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