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Using a recently-developed time-of-flight measurement technique with 1 pstime resolution and electron-energy spectroscopy, we developed a method tomeasure the longitudinal-optical-phonon emission rate of hot electronstravelling along a depleted edge of a quantum Hall bar. A comparison of theexperimental results to a single-particle model implies that the mainscattering mechanism involves a two-step process via intra-Landau-leveltransition. We show this scattering can be suppressed by controlling the edgepotential profile, and a scattering length > 1 mm can be achieved, allowing theuse of this system for scalable single-electron device applications.

LO-phonon emission rate of hot electrons from an on-demand single-electron source in a GaAs/AlGaAs heterostructure