Two-Electron Photon Emission From Metallic Quantum Wells
Germar Hoffmann (1), Richard Berndt (1), and Peter Johansson (2) ((1), University of Kiel, Germany; (2) University of Orebro, Sweden)
TL;DR
This paper reports the observation of visible light emission in a quantum well system that exceeds the energy of tunneling electrons, explained by two-electron processes modeled to match experimental spectra and emission characteristics.
Contribution
It introduces a model for two-electron processes causing photon emission in quantum wells, aligning with experimental observations and providing new insights into quantum well fluorescence.
Findings
Photon emission energies exceed electron energies.
Model reproduces experimental spectra and quantum yield.
Emission intensity follows a power-law with excitation current.
Abstract
Unusual emission of visible light is observed in scanning tunneling microscopy of the quantum well system Na on Cu(111). Photons are emitted at energies exceeding the energy of the tunneling electrons. Model calculations of two-electron processes which lead to quantum well transitions reproduce the experimental fluorescence spectra, the quantum yield, and the power-law variation of the intensity with the excitation current.
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