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Mean free path of ballistic electrons in GaAs/AlGaAs superlattices

✍ Scribed by C. Rauch; G. Strasser; M. Kast; E. Gornik

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
56 KB
Volume
25
Category
Article
ISSN
0749-6036

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✦ Synopsis

The mean free path of ballistic electrons in GaAs/AlGaAs superlattices was measured using the technique of hot electron spectroscopy in magnetic fields perpendicular to the growth direction. We utilize the fact that the total effective path of an injected hot electron is a function of the applied magnetic field. For a superlattice with 6.5 nm GaAs wells and 2.5 nm GaAlAs barriers we measure a mean free path of 80 nm. The experimental results of a ten-period SL sample are compared to a fully three-dimensional calculation of the transmission including interface roughness with island sizes of 10 nm. We demonstrate that the observed mfp is limited due to interface roughness scattering for temperatures up to 50 K.

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