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HL: Fachverband Halbleiterphysik

HL 11: Plasmonics and Nanooptics I: Light-Matter Interactions

HL 11.4: Vortrag

Montag, 20. März 2017, 11:15–11:30, TRE Ma

Photon emission from plasmonic tunnel junctions including a microscope tip and metallic quantum wells — •Tomoki Sueyoshi, Peter-Jan Peters, and Richard Berndt — Institut für Experimentelle und Angewandte Physik, CAU Kiel, Germany

Radiative decay processes involving tunneling electrons are studied by probing light emission from metallic quantum-well (QW) junctions in a scanning tunneling microscope. The electronic states of Pb QWs on Ag(111) are controlled with the number of Pb layers and identified by scanning tunneling spectroscopy. The luminescence from the tip-QW-metal junctions involves radiative decay of tip-induced localized plasmons excited by inelastic tunneling electrons. The observed optical spectra reflect the plasmon density of states in the junctions. In addition, intense emission is observed from transitions of tunneling electrons between unoccupied QW states. These results demonstrate plasmon-assisted luminescence induced by tunneling electrons in the QW tunnel junctions.