title: Time-of-Flight Measurements of Single-Electron Wave Packets in Quantum Hall Edge States.
abstract: We 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[over →]×B[over →] drift. The edge potential is estimated from the energy dependence of v using a harmonic approximation.
authors.affiliation: National Physical Laboratory, Hampton Road, Teddington, Middlesex TW11 0LW, United Kingdom.
authors.forename: M
authors.initials: M
authors.lastname: Kataoka
authors.affiliation: National Physical Laboratory, Hampton Road, Teddington, Middlesex TW11 0LW, United Kingdom.|London Centre for Nanotechnology, and Department of Electronic and Electrical Engineering, University College London, Torrington Place, London WC1E 7JE, United Kingdom.
authors.forename: N
authors.initials: N
authors.lastname: Johnson
authors.affiliation: Department of Physics and Mathematics, University of Hull, Kingston-upon-Hull HU6 7RX, United Kingdom.
authors.forename: C
authors.initials: C
authors.lastname: Emary
authors.affiliation: National Physical Laboratory, Hampton Road, Teddington, Middlesex TW11 0LW, United Kingdom.
authors.forename: P
authors.initials: P
authors.lastname: See
authors.affiliation: Cavendish Laboratory, University of Cambridge, J. J. Thomson Avenue, Cambridge CB3 0HE, United Kingdom.
authors.forename: J P
authors.initials: JP
authors.lastname: Griffiths
authors.affiliation: Cavendish Laboratory, University of Cambridge, J. J. Thomson Avenue, Cambridge CB3 0HE, United Kingdom.
authors.forename: G A C
authors.initials: GA
authors.lastname: Jones
authors.affiliation: Cavendish Laboratory, University of Cambridge, J. J. Thomson Avenue, Cambridge CB3 0HE, United Kingdom.
authors.forename: I
authors.initials: I
authors.lastname: Farrer
authors.affiliation: Cavendish Laboratory, University of Cambridge, J. J. Thomson Avenue, Cambridge CB3 0HE, United Kingdom.
authors.forename: D A
authors.initials: DA
authors.lastname: Ritchie
authors.affiliation: London Centre for Nanotechnology, and Department of Electronic and Electrical Engineering, University College London, Torrington Place, London WC1E 7JE, United Kingdom.
authors.forename: M
authors.initials: M
authors.lastname: Pepper
authors.affiliation: National Physical Laboratory, Hampton Road, Teddington, Middlesex TW11 0LW, United Kingdom.
authors.forename: T J B M
authors.initials: TJ
authors.lastname: Janssen