Kataoka, MJohnson, NEmary, CSee, PGriffiths, JPJones, GACFarrer, IRitchie, DavidPepper, MJanssen, TJBMLaboratory of Adsorption and Catalysis (LADCA)2019-04-262019-04-2622/03/16https://dspace7-entities.atmire.com/handle/atmire/447We report time-of-flight measurements on electrons traveling in quantum Hall edge states. Hot-electron wave packets are emitted one per cycle into edge states formed along a depleted sample boundary. The electron arrival time is detected by driving a detector barrier with a square wave that acts as a shutter. By adding an extra path using a deflection barrier, we measure a delay in the arrival time, from which the edge-state velocity v is deduced. We find that v follows 1=B dependence, in good agreement with the E × B drift. The edge potential is estimated from the energy dependence of v using a harmonic approximation.