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Coherent electron transfer occurs between silver nanoclusters and graphite via dipole coupling. This ultrafast charge transfer, observed using multidimensional multiphoton photoemission spectroscopy, completes within 10 femtoseconds.

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Surface science

Background:

  • Charge transfer at metal-semiconductor heterojunctions is crucial for energy transduction.
  • Current models favor incoherent internal photoemission of hot electrons.
  • Coherent charge transfer via dipole coupling offers an alternative mechanism.

Purpose of the Study:

  • To investigate the mechanism of charge transfer at the Ag nanocluster/graphite interface.
  • To elucidate the role of coherent electron transfer in energy transduction.
  • To probe ultrafast electronic dynamics at heterojunctions.

Main Methods:

  • Time-resolved multiphoton photoemission spectroscopy (MPP).
  • Multidimensional MPP spectroscopy to resolve electronic dynamics.
  • Studying chemisorption of Ag nanoclusters on graphite.

Main Results:

  • Observed coherent electron transfer from an interface state to graphite's interlayer band.
  • Identified a resonant two-photon transition.
  • Determined dephasing time of approximately 10 fs, indicating ultrafast transfer.

Conclusions:

  • Coherent electron transfer is a viable mechanism at metal-semiconductor interfaces.
  • Ultrafast charge transfer dynamics can be precisely measured using multidimensional MPP.
  • This finding impacts understanding of light-energy conversion processes.