Regensburg 2025 – scientific programme
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O: Fachverband Oberflächenphysik
O 43: Scanning Probe Microscopy: Light-Matter Interactions at the Atomic Scale II
O 43.4: Talk
Tuesday, March 18, 2025, 14:45–15:00, H24
Theoretical Study of Electronic and Optical Properties in Edge-Modified Graphene Nanoribbons — •Jian Cheng Wong1, Song Jiang2, Sofia Canola1, Alex Boeglin2, Guillaume Schull2, and Tomáš Neuman1 — 1Institute of Physics, Czech Academy of Sciences, Cukrovarnická 10, 16200 Prague, Czech Republic — 2Université de Strasbourg, IPCMS, CNRS, UMR 7504, F-67000 Strasbourg, France
Graphene nanoribbon (GNR) exhibits electronic and optical properties tunable by its geometry. One such approach is to introduce localized electronic states by modifying the edge structure. A previous study [1] using scanning tunneling microscopy-induced luminescence (STML) revealed that the presence of localized single-particle end states in GNR contributed to the formation of localized optical excitations. Here we provide an extensive theoretical description of such excitations on the modified edge structure of GNRs, and how it interacts with the end states. To that end, we develop a many body model that incorporates ab initio electronic structure methods and elucidate the sequence of events involved that leads to the eventual light emission under STML. From this model, we compare the electroluminescence maps obtained with experimental results and show the microscopic details of the localized states probed by STML.
[1] Song et al., Science, 379(6636), 1049-1054 (2023).
Keywords: Scanning tunneling microscopy; Graphene nanoribbon; Light-matter interaction