LO-Phonon Emission Rate of Hot Electrons from an On-Demand Single-Electron Source in a GaAs/AlGaAs Heterostructure.


Change log
Authors
Johnson, N 
Emary, C 
Ryu, S 
Sim, H-S 
See, P 
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.

Description
Keywords
0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics
Journal Title
Phys Rev Lett
Conference Name
Journal ISSN
0031-9007
1079-7114
Volume Title
121
Publisher
American Physical Society (APS)
Sponsorship
Engineering and Physical Sciences Research Council (EP/K004077/1)