Filament dynamics in the voltage-driven insulator-to-metal transition

ORAL

Abstract

Certain correlated oxides feature an insulator-to-metal transition which can be triggered by applying an external voltage: the material becomes conducting if a threshold electric field is exceeded. This phenomenon is known as voltage-driven IMT, and it has very promising applications in emerging technologies such as optoelectronics and neuromorphic computing. While it is known that this process takes place in a filamentary way, it is not yet known how these filaments nucleate, grow and relax. We combine reflectivity and transport measurements to image metallization with spatial and temporal resolution. Five correlated oxides from two different families are analyzed: VO2, V2O3, V3O5, NdNiO3 and SmNiO3, finding remarkable differences in the filament expansion process. By comparing these systems and with the insight of numerical simulations, we identify the key parameters that govern the dynamics of the voltage-driven IMT.

*The nickelate research was done at the University of Geneva and supported by the SNSF through an Ambizione Fellowship (#PZ00P2_185848), while the vanadate research was done at UCSD and supported by the Q-MEEN-C Energy Frontier Research Center, funded by the U.S. Department of Energy, Office of Science, Basic Energy Sciences (# DE-SC0019273).

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Presenters

  • Javier del Valle

    • Department of Quantum Matter Physics, University of Geneva
    • University of Geneva
    • Univ of Geneva

Authors

  • Javier del Valle

    • Department of Quantum Matter Physics, University of Geneva
    • University of Geneva
    • Univ of Geneva

  • Nicolas M Vargas

    • Department of Physics, University of California, San Diego
    • University of California, San Diego
    • Department of Physics, University of California San Diego

  • Pavel Salev

    • Dept. of Physics and Center for Advanced Nanoscience, UCSD, La Jolla, CA, USA
    • Department of Physics, University of California, San Diego
    • University of California, San Diego

  • Rodolfo Rocco

    • Université Paris-Saclay

  • Claribel Dominguez Ordonez

    • Department of quantum matter physics, Univ of Geneva
    • Univ of Geneva

  • Jennifer Fowlie

    • Department of Quantum Matter Physics, University of Geneva
    • Department of quantum matter physics, Univ of Geneva
    • Univ of Geneva

  • Pavel Lapa

    • University of California, San Diego

  • Yoav Kalcheim

    • Faculty of Materials Science and Engineering, Technion - Israel Institute of Technology
    • Faculty of Materials Science and Engineering, Technion-Israel Institute of Technology
    • Technion - Israel Institute of Technology
    • Technion-Israel Institute of Technology
    • University of California, San Diego

  • Coline Adda

    • University of California, San Diego
    • Department of Physics, University of California, San Diego
    • Department of Physics, University of California San Diego

  • Minhan Lee

    • Materials Science and Engineering Program, University of California, San Diego
    • Department of Physics, University of California, San Diego
    • University of California, San Diego
    • Department of Physics, University of California San Diego

  • Stefano Gariglio

    • Univ of Geneva

  • Marcelo Rozenberg

    • Laboratoire de Physique des Solides, Université Paris Saclay
    • CNRS
    • Laboratoire de Physique des Solides, CNRS
    • Université Paris-Saclay

  • Jean-Marc Triscone

    • Department of Quantum Matter Physics, University of Geneva
    • Department of quantum matter physics, Univ of Geneva
    • Univ of Geneva

  • Ivan Schuller

    • University of California, San Diego
    • Dept. of Physics and Center for Advanced Nanoscience, UCSD, La Jolla, CA, USA
    • Physics Department, University of California, San Diego
    • Department of Physics, University of California, San Diego