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Illumination induces stress in opaque glasses. Researchers used scanning tunneling microscopy to observe amorphous silicon carbide surface dynamics, revealing light-driven cluster hopping via an athermal mechanism.

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Area of Science:

  • Materials Science
  • Surface Science
  • Condensed Matter Physics

Background:

  • Illumination can induce stress and morphological changes in opaque glasses.
  • Amorphous silicon carbide (a-SiC) possesses a smaller bandgap compared to crystalline SiC.

Purpose of the Study:

  • To investigate the dynamics of amorphous silicon carbide (a-SiC) surfaces under illumination.
  • To elucidate the mechanism by which light influences glassy surface dynamics.

Main Methods:

  • Utilized scanning tunneling microscopy (STM) to record time-lapse movies of a-SiC surface dynamics.
  • Employed 532 nm light to photoexcite a 1 μm amorphous surface layer on a SiC crystal.
  • Achieved high temporal (40 s) and spatial (sub-nanometer) resolution over extended periods (up to 6 × 10^4 s).

Main Results:

  • Observed cooperative hopping of amorphous silicon carbide clusters (3-5 glass forming units in diameter) between surface states.
  • Found that photoexcitation recruits immobile clusters to hop, rather than accelerating mobile clusters.
  • Confirmed no significant laser-induced heating, supporting an athermal mechanism.

Conclusions:

  • Electronic excitation of a-SiC directly controls glassy surface dynamics through an athermal mechanism.
  • Proposed an exciton migration-relaxation-thermal diffusion model to explain the observed phenomena.
  • Suggested that cluster hopping and matrix rearrangement may underlie photoinduced aging in opaque glasses.