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Related Experiment Videos

Two-electron photon emission from metallic quantum wells.

Germar Hoffmann1, Richard Berndt, Peter Johansson

  • 1Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, D-24098 Kiel, Germany.

Physical Review Letters
|February 7, 2003
PubMed
Summary

Scanning tunneling microscopy revealed unusual visible light emission from sodium quantum wells on copper. Model calculations confirmed two-electron processes explain this photon emission exceeding electron energy.

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Area of Science:

  • Surface Science
  • Condensed Matter Physics
  • Quantum Optics

Background:

  • Scanning tunneling microscopy (STM) is a powerful tool for atomic-scale surface analysis.
  • Quantum well systems exhibit unique electronic and optical properties.
  • Light emission in STM (STM-induced luminescence) typically involves single-electron processes.

Purpose of the Study:

  • Investigate unusual visible light emission in a sodium (Na) quantum well system on a copper (Cu(111)) surface.
  • Explore the underlying physical mechanisms responsible for the observed photon emission.
  • Compare experimental findings with theoretical models.

Main Methods:

  • Utilized scanning tunneling microscopy (STM) to probe the Na/Cu(111) quantum well system.
  • Analyzed the energy spectra and intensity of the emitted visible light.

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  • Performed theoretical model calculations based on two-electron processes.

    • Main Results:

    • Observed unusual emission of visible light, with photons having energies higher than the tunneling electrons.
    • Experimental fluorescence spectra and quantum yield were successfully reproduced by model calculations.
    • The power-law dependence of light intensity on excitation current matched theoretical predictions.

    Conclusions:

    • The study demonstrates that two-electron processes can lead to quantum well transitions and photon emission exceeding electron energy.
    • This work provides a new understanding of light emission mechanisms in quantum well systems under STM.
    • The findings highlight the potential of STM for exploring complex electronic and optical phenomena in nanostructures.