Electron-beam collimation with a quantum point contact

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Abstract
Collimation of the electron beam injected by a point contact in a two-dimensional electron gas is demonstrated using a geometry with two opposite point contacts as injector and collector. The collimation is maintained over a distance of at least 4 μm, and is destroyed by a small magnetic field. The inferred collimation factor scales linearly with the point-contact resistance, as predicted by the semiclassical theory.