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Berlin 2018 – scientific programme

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O: Fachverband Oberflächenphysik

O 13: Plasmonics and nanooptics: Light-matter interaction, spectroscopy I

O 13.10: Talk

Monday, March 12, 2018, 17:30–17:45, MA 041

Electron-induced photon emission above the quantum cutoff due to time-energy uncertainty — •Kira Kolpatzeck, Philip Kapitza, Ebru Ekici, Christian A. Bobisch, and Rolf Möller — Faculty of Physics, Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, 47057 Duisburg, Germany

We have studied the light emission resulting from inelastic tunneling processes in the tip/sample junction between a silver covered PtIr tip and an Ag(111) surface with a low-temperature scanning tunneling microscope at 80 K. The observed light emission between the visible and the near infrared range carries information about the underlying inelastic processes. It has been studied around the cutoff at hν=eVT.

A detailed analysis of the emission spectra normalized to a reference spectrum recorded at high voltages shows emission tails exceeding the energy eVT provided by the the applied voltage VT. For a satisfying explanation the consideration of thermal broadening of the electron Fermi distribution is insufficient. However, a correct description is found if a finite lifetime of the excited states in the range of 30-80 fs, causing a natural linewidth broadening, is included [1].

[1] E. Ekici, P.Kapitza, C. A. Bobisch, R. Möller, Opt. Lett. 42, 4585-4588 (2017).

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