Quantum Coherent Multielectron Processes in an Atomic Scale Contact
Peter-Jan Peters, Fei Xu, Kristen Kaasbjerg, Gianluca Rastelli,, Wolfgang Belzig, and Richard Berndt
TL;DR
This paper investigates quantum coherent multielectron processes in atomic-scale contacts through light emission analysis from a scanning tunneling microscope on silver, revealing new insights into electron-plasmon interactions at low temperatures.
Contribution
It introduces a model of electrons interacting via a localized plasmon-polariton mode that explains experimental optical spectra and spectral features in atomic-scale contacts.
Findings
Emission with photon energies greater than 2eV observed
Model reproduces spectral kinks at eV and 2eV
Scaling behavior of emission intensity explained
Abstract
The light emission from a scanning tunneling microscope operated on a Ag(111) surface at 6 K is analyzed from low conductances to values approaching the conductance quantum. Optical spectra recorded at a sample voltages V reveal emission with photon energies hv> 2eV. A model of electrons interacting coherently via a localized plasmon-polariton mode reproduces the experimental data, in particular the kinks in the spectra at eV and 2eV as well as the scaling of the intensity at low and intermediate conductances.
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