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O: Fachverband Oberflächenphysik

O 11: Plasmonics and Nanooptics II: Microscopy

O 11.10: Talk

Monday, March 7, 2016, 17:30–17:45, S054

Plasmon-mediated circularly polarized luminescence of GaAs in a scanning tunneling microscope — Svenja Mühlenberend, Markus Gruyters, and •Richard Berndt — Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, 24098 Kiel, Germany

The electroluminescence from p-type GaAs(110) in a scanning tunneling microscope has been investigated at 6 K. Unexpectedly high degrees of circular polarization have often been observed with ferromagnetic Ni tips and also with paramagnetic W and Ag tips. The data is interpreted in terms of two distinct excitation mechanisms. Electron injection generates intense luminescence with low polarization. Plasmon-mediated generation of electron-hole pairs leads to less intense emission, which, however, is highly polarized for many tips.