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Related Experiment Video

Updated: Feb 26, 2026

In Situ Transmission Electron Microscopy with Biasing and Fabrication of Asymmetric Crossbars Based on Mixed-Phased a-VOx

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Published on: May 13, 2020

Switching speed limits in electrically driven VO₂ structural Mott-Peierls transition.

Alexandre Pofelski¹, Chuhang Liu², Spencer A Reisbick²

¹Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York, USA. pofelska@mcmaster.ca.

Nature Communications

|February 24, 2026

Summary

This summary is machine-generated.

Researchers visualized the ultrafast dynamics of vanadium dioxide (VO2) switching using a novel electron microscope. They found that phonon-mediated recovery limits GHz switching, but device engineering can tune reversible operation.

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All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics

All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics

Published on: January 19, 2018

Area of Science:

Condensed Matter Physics
Materials Science
Quantum Electronics

Background:

Mott materials are crucial for next-generation electronics and photonics.
Vanadium dioxide (VO2) exhibits a near-room-temperature insulator-to-metal transition, making it a key research material.
Understanding VO2 phase transition dynamics is vital for advanced applications.

Purpose of the Study:

To directly visualize the electrically driven transition dynamics in VO2.
To investigate the ultrafast nucleation, propagation, and dissolution of metallic domains.
To determine the factors limiting reversible switching at high frequencies.

Main Methods:

Utilized a microwave-driven, frequency-tunable pulsed transmission electron microscope.
Achieved nanometer spatial and picosecond temporal resolution.
Studied VO2 devices under high-frequency (MHz-GHz) electrical excitation.

Main Results:

Observed ultrafast formation of metallic nuclei beneath electrodes in VO2.
Captured structural phase front propagation at 4.54 nm/ns.
Identified phonon-mediated structural recovery as the limiting factor for GHz reversible switching.

Conclusions:

Phonon-mediated recovery limits VO2 reversible switching at GHz frequencies.
Reversible operation can be tuned from kHz to GHz through device engineering.
The developed technique offers a framework for studying non-equilibrium transformations in functional materials.