Size-scaling experiment in a two-dimensional electron gas using an inhomogeneous magnetic field due to a superconducting gate

A. K. Geim, S. V. Dubonos, I. V. Grigorieva, S. J. Bending

    Research output: Contribution to journalArticlepeer-review

    Abstract

    We have used a superconducting gate on the top of a two-dimensional electron gas (2DEG) to partition an external magnetic field into a distribution of submicron flux tubes (vortices) and measure the weak localisation contribution to the 2DEG conductance versus spatial separation of the vortices. It is found that the effect of a vortex extends far beyond its actual size. The experiment is discussed in terms of size scaling of the quantum conductance. The measured minimum size of an independent region of a 2DEG is in agreement with the phase-breaking length of electrons as deduced from the weak localisation magnetoresistance.
    Original languageEnglish
    Pages (from-to)311-314
    Number of pages3
    JournalSurface Science
    Volume361-362
    DOIs
    Publication statusPublished - 20 Jul 1996

    Keywords

    • Electrical transport
    • Heterojunctions
    • Quantum effect
    • Superconductor-semiconductor thin film structures

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