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O: Fachverband Oberflächenphysik
O 20: Poster Scanning Probe Microscopy: Light-Matter Interactions at the Atomic Scale
O 20.7: Poster
Montag, 17. März 2025, 18:00–20:00, P2
A theoretical perspective on electroluminescence, photoluminescence and photocurrent generation in a scanning tunneling microscope — •Tomáš Neuman1, Sofia Canola1, Rodrigo Ferreira1, Anna Roslawska2, Katharina Kaiser3, Alex Boeglin4, Andrei Borisov5, Guillaume Schull4, and Martin Švec1 — 1Institute of Physics of the Czech Academy of Sciences, Prague, Czechia — 2Max Planck Institute for Solid State Research, Stuttgart, Germany — 3Georg-August-Universität Göttingen, Göttingen, Germany — 4Université de Strasbourg, IPCMS, CNRS, UMR 7504, Strasbourg, France — 5Université Paris-Saclay, Institut des Sciences Moléculaires d'Orsay, CNRS, UMR 8214, Orsay, France
The phenomena occurring in a scanning tunneling microscope (STM) that lead to the generation of light or are triggered by light (STM+light, STM+L), including the STM-induced luminescence and photocurrent generation in single molecules, allowed for studying excited states of molecules in a STM. As the underlying principles of these phenomena involve electron tunneling, plasmon-enhanced optical absorption and spontaneous emission, and vibronic effects, interpreting these STM+L experiments hinges on the development of theoretical models. I will show such modelling strategies and showcase its application to recent experiments. In particular, I will focus on the theory of mapping of orbitals of a multireference excited state of a small molecule (perylene tetracarboxylic dianhydride - PTCDA) via photocurrent generation, whose explanation requires all the mentioned ingredients.
Keywords: scanning-tunneling microscopy; atomic-scale optics; theory; photocurrent