Non-equilibrium transport in VO$_2$ nanoparticles

ORAL

Abstract

Over recent years, the insulator to metal transition of the vanadium dioxide (VO$_2$) Mott insulator has been revisited revealing surprising new features: (i) electronic inhomogeneities were mapped out by local infrared spectroscopy near the transition temperature T$_{IM}$; (ii) electric-field-induced resistance switching has been found in this material. To further investigate the insulator/metal transition, we have performed non-equilibrium transport measurements on 200nm VO$_2$ dots using a variable temperature/magnetic field conducting AFM setup. I(V) spectra of numerous VO$_2$ dots as a function of temperature have enabled us to determine the voltage threshold, the current jump and the the noise spectrum as voltage is swept across the electric-field-induced transition.

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Authors

  • B. Wu

    • LPEM, Ecole Superieure de Physique et de Chimie Industrielles de la ville de Paris (ESPCI), Paris, France

  • A. Zimmers

    • LPEM, Ecole Superieure de Physique et de Chimie Industrielles de la ville de Paris (ESPCI), Paris, France

  • H. Aubin

    • Laboratoire Photons et Mati\`ere (CNRS), ESPCI
    • LPEM, Ecole Superieure de Physique et de Chimie Industrielles de la ville de Paris (ESPCI), Paris, France

  • R. Ghosh

    • Department of Physics and Astronomy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, USA

  • Y. Liu

    • Department of Physics and Astronomy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, USA

  • R. Lopez

    • University of North Carolina at Chapel Hill
    • University of North Carolina
    • Department of Physics and Astronomy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, USA