Abstract
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 AlGaAs/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° 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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