Berlin 2024 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 26: Nanotubes and Nanoribbons

TT 26.6: Vortrag

Dienstag, 19. März 2024, 10:45–11:00, H 3007

Ultrafast Dynamics of Laser-Excited Topological Edge States in Graphene Nanoribbon Heterostructures — •Jan-Philip Joost and Michael Bonitz — Kiel University, Institute for Theoretical Physics and Astrophysics, 24098 Kiel, Germany

The electromagnetic properties of finite graphene nanoribbon (GNR) heterostructures are strongly affected by localized topological edge states [1].Recently, we showed for 7-9-armchair-GNRs that the increased electronic correlations of these states results in increased magnetic moments at the ribbon edges accompanied by a significant energy renormalization of the topological end states, even in the presence of a metallic substrate [2]. Here, we improve the description of the system by including long-range Coulomb interactions within the Pariser–Parr–Pople Model. We study the ultrafast electron response in a freestanding unit cell of the 7-9-armchair-GNR following a laser excitation by employing our newly developed dynamically screened ladder (DSL) approximation within the G1–G2 scheme [3], which goes well beyond the GW description by including strong coupling effects. We find that the localized edge states play a major role in the ultrafast electron dynamics within the first 30fs after the laser interaction.

[1] J.-P. Joost et al., Nano Lett. 19 (2019) 9045

[2] D. J. Rizzo et al., Nature 560 (2018) 204

[3] J.-P. Joost et al., Phys. Rev. B 105 (2022) 165155

Keywords: graphene nanoribbons; GNR; laser; edge states; G1-G2