Journal
PHYSICAL REVIEW LETTERS
Volume 121, Issue 13, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.121.137703
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Funding
- United Kingdom Department for Business, Energy, and Industrial Strategy
- United Kingdom EPSRC
- project EMPIR [15SIB08 e-SI-Amp]
- European Metrology Programme for Innovation and Research (EMPIR) program
- European Union's Horizon 2020 research and innovation program
- Korea NRF [2016R1A5A1008184]
- EPSRC [EP/P034012/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/P034012/1] Funding Source: researchfish
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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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