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O: Fachverband Oberflächenphysik

O 11: Plasmonics and Nanooptics II: Light-Matter Interaction

O 11.1: Vortrag

Montag, 20. März 2017, 15:00–15:15, TRE Ma

Three-electron photon interaction mediated by localized plasmons — Peter-Jan Peters and •Richard Berndt — Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, 24098 Kiel

The light emission from a scanning tunneling microscope operated on Ag(111) surfaces at 5 K is analyzed from low conductances G to values approaching the conductance quantum. Optical spectra reveal emission due to localized plasmons with photon energies exceeding the applied bias more than twice (h ν > 3 e V). The emission intensity varies in a non-monotonic fashion with G. An empirical model reproduces the scaling of the photon yield and the optical spectra near the thresholds for two-electron and three-electron processes. While some heating of the electron gas occurs, the predominat part of the light emission is due to coherent processes.