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

Johnson, N; Emary, C; Ryu, S; Sim, H-S; See, P; Fletcher, JD; Griffiths, JP; ... Kataoka, M; + view all (2018) LO-Phonon Emission Rate of Hot Electrons from an On-Demand Single-Electron Source in a GaAs/AlGaAs Heterostructure. Physical Review Letters , 121 (13) , Article 137703. 10.1103/PhysRevLett.121.137703. Green open access

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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.

Type: Article
Title: LO-Phonon Emission Rate of Hot Electrons from an On-Demand Single-Electron Source in a GaAs/AlGaAs Heterostructure
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevLett.121.137703
Publisher version: https://doi.org/10.1103/PhysRevLett.121.137703
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Ballistic transport, Mesoscopics, Optical phonons, Phonons, Quantum Hall effect, Semiconductors, Heterostructures, Condensed Matter & Materials Physics
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
URI: https://discovery.ucl.ac.uk/id/eprint/10058602
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