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O: Fachverband Oberflächenphysik

O 43: Scanning probe microscopy: light matter interaction at atomic scales – Poster

O 43.16: Poster

Dienstag, 10. März 2026, 14:00–16:00, P2

Optics of Edge-Modified Graphene Nanoribbons: A Theoretical Perspective — •Jian Cheng Wong¹, Song Jiang², Guillaume Schull², and Tomáš Neuman¹ — ¹Institute of Physics, Czech Academy of Sciences, Cukrovarnická 10, 16200 Prague, Czech Republic — ²Université de Strasbourg, CNRS, IPCMS, UMR 7504, F-67000 Strasbourg, France

Atomic-scale engineering of graphene nanoribbons (GNRs) provides a versatile means to tune their electronic and optical properties. We present a theoretical study of edge-modified GNRs that describe the process resulting in excitonic emission under scanning tunneling microscopy-induced luminescence (STML). The modified edge structure forms localized states in GNR similar to the end states studied formerly[1]. From the electroluminescence maps, we explore how interactions between two of these localized states change the optical properties depending on the GNR structure. For this, we construct a many-body model which describes the dynamics of tip-induced charging/discharging and relaxation that eventually leads to light emission.

[1] Song et al., Science, 379(6636), 1049-1054 (2023).

Keywords: Scanning tunneling microscopy; Graphene nanoribbon; Light-matter interaction