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Shortly after de Broglie published his ideas that the electron in a hydrogen atom could be better thought of as being a circular standing wave instead of a particle moving in quantized circular orbits, Erwin Schrödinger extended de Broglie’s work by deriving what is now known as the Schrödinger equation. When Schrödinger applied his equation to hydrogen-like atoms, he was able to reproduce Bohr’s expression for the energy and, thus, the Rydberg formula governing hydrogen spectra.
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Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing
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Quantum Coherent Multielectron Processes in an Atomic Scale Contact.

Peter-Jan Peters1, Fei Xu2, Kristen Kaasbjerg3

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

Physical Review Letters
|September 27, 2017
PubMed
Summary
This summary is machine-generated.

Scanning tunneling microscopy on silver surfaces reveals light emission above 2eV. A coherent electron interaction model explains spectral features and intensity scaling, advancing nanoscale optics understanding.

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Area of Science:

  • Condensed Matter Physics
  • Surface Science
  • Nanophotonics

Background:

  • Scanning tunneling microscopy (STM) enables atomic-scale surface investigation.
  • Light emission phenomena in nanoscale systems are crucial for optoelectronic devices.
  • Understanding electron-photon interactions at surfaces is key to controlling light emission.

Purpose of the Study:

  • To analyze light emission spectra from a scanning tunneling microscope on a silver surface.
  • To investigate the relationship between conductance, voltage, and emitted photon energies.
  • To develop a theoretical model explaining the observed optical spectra.

Main Methods:

  • Operating a scanning tunneling microscope on a Ag(111) surface at cryogenic temperatures (6 K).
  • Recording optical spectra at various sample voltages (V).
  • Analyzing spectral features, including kinks and intensity scaling with conductance.

Main Results:

  • Observed light emission with photon energies greater than 2 electron volts (eV).
  • Identified distinct spectral kinks at eV and 2eV.
  • Demonstrated that a model of coherent electron interaction via localized plasmon-polaritons reproduces experimental data.

Conclusions:

  • The localized plasmon-polariton model accurately describes the observed light emission.
  • Electron-photon interactions in STM on Ag(111) are governed by coherent processes.
  • This work provides insights into nanoscale light generation and control.