Reflection of Ballistic Electrons by Diffusive 2-Dimensional Contacts

A K Geim, P C Main, R Taboryski, H Carmona, C V Brown, T J Foster, R B S Oakeshott, E Veje

    Research output: Contribution to journalArticlepeer-review

    Abstract

    We report quenching of high-magnetic-field Shubnikov-de Haas oscillations and shrinking of the Hall plateaux with decreasing temperature in a quantum Hall effect conductor with low-mobility contact leads. Selective He-ion bombardment has been employed to reduce the mobility of a two-dimensional electron gas in the contacts. We explain the results in terms of the Milne reflection of the electrons from these disordered regions. At sufficiently low temperatures, inelastic scattering is suppressed and electrons are scattered back by elastic collisions before thermalisation can occur.
    Original languageEnglish
    Pages (from-to)1005-1009
    Number of pages5
    JournalSolid-state electronics
    Volume37
    Issue number4-6
    Publication statusPublished - 1994

    Keywords

    • high magnetic-fields
    • quantum transport
    • heterostructures
    • conductors
    • scattering
    • regime

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