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Reflection and transmission of ballistic electrons at a potential barrier

✍ Scribed by Th. Schäpers; F. Müller; A. Förster; B. Lengeler; H. Lüth

Publisher
Elsevier Science
Year
1993
Tongue
English
Weight
303 KB
Volume
14
Category
Article
ISSN
0749-6036

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✦ Synopsis

The reflection as well as transmission of ballistic electrons at a potential barrier is studied as a function of the angle of incidence. The samples are based on high mobility two dimensional electron gases in (\mathrm{AlGaAs} / \mathrm{GaAs})-heterostructures using split gate point contacts for collimated emission as well as detection of ballistic electron beams. The variable electrostatic barrier is formed as a depletion space charge layer by biasing a (45^{\circ}) tilted gate strip. An external magnetic field is used to adjust the angle of incidence. The experimental results are compared to a model for the transmission and reflection coefficients at a potential boundary.

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