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Probing optically driven K3C60 thin films with an ultrafast voltmeter.

J D Adelinia, E Wang1, M Chavez-Cervantes1

  • 1Max Planck Institute for the Structure and Dynamics of Matter, Hamburg, Germany.

Structural Dynamics (Melville, N.Y.)
|March 28, 2025
PubMed
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Researchers investigated optically driven superconductivity in potassium-doped fullerene (K3C60) thin films. Ultrafast voltage measurements revealed insights into granular effects, kinetic inductance, and Josephson dynamics, advancing quantum material research.

Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Optics

Background:

  • Optically enhanced superconductivity in K3C60 is observed but its underlying physics and relation to equilibrium superconductivity remain unclear.
  • Understanding the dynamics of photo-induced superconductivity is crucial for novel quantum electronic applications.

Purpose of the Study:

  • To investigate the ultrafast voltage response of optically driven K3C60 thin films.
  • To elucidate the role of granularity in photo-induced transport phenomena.
  • To explore the potential for optoelectronic device applications.

Main Methods:

  • Utilized ultrafast nonlinear transport measurements with photo-conductive switches.
  • Measured time-resolved voltage changes in K3C60 thin films below and above the critical temperature (Tc).

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Last Updated: May 11, 2026

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  • Analyzed data considering granular effects, kinetic inductance, and Josephson dynamics.

    • Main Results:

    • Observed fast voltage changes attributed to in-grain carrier kinetic inductance.
    • Identified a slower voltage response potentially linked to Josephson dynamics at weak links.
    • Estimated in-grain photo-induced superfluid density and phase slip dynamics.

    Conclusions:

    • Granularity plays a significant role in the photo-induced transport response of K3C60.
    • Ultrafast electrical measurements provide new insights into optically driven quantum materials.
    • K3C60 presents a promising platform for ultrafast optoelectronic devices.