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Preparing a Celadonite Electron Source and Estimating Its Brightness
Published on: November 5, 2019
LO-Phonon Emission Rate of Hot Electrons from an On-Demand Single-Electron Source in a GaAs/AlGaAs Heterostructure
N Johnson1,2, C Emary3, S Ryu4
1National Physical Laboratory, Hampton Road, Teddington, Middlesex TW11 0LW, United Kingdom.
Abstract:
Using a recent time-of-flight measurement technique with 1 ps time resolution and electron-energy spectroscopy, we develop a method to measure the longitudinal-optical-phonon emission rate of hot electrons traveling along a depleted edge of a quantum Hall bar. Comparison to a single-particle model implies the scattering mechanism involves a two-step process via an intra-Landau-level transition. We show that this can be suppressed by control of the edge potential profile, and a scattering length >1 mm can be achieved, allowing the use of this system for scalable single-electron device applications.
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