Ultrafast Correlated Electron Dynamics in Finite Graphene Nanostructures

Finite graphene nanoribbon (GNR) heterostructures host intriguing topological in-gap states [1]. These states may be localized either at the bulk edges or at the ends of the structure. In a previous work we showed that correlation effects play a key role in these systems, resulting 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 present new results on the ultrafast electronic response of these systems following an optical laser excitation. The nanostructures are described in the PPP model taking into account long-range Coulomb interactions. The correlated electron dynamics is treated within the GW approximation utilizing the newly developed G1-G2 scheme [3,4].

[1] T. Cao et al., Phys. Rev. Lett., 119 (2017) 076401
[2] J.-P. Joost, A.-P. Jauho, M. Bonitz, Nano Letters, 19 (2019) 9045-9050
[3] N. Schlünzen, J.-P. Joost, M. Bonitz, Phys. Rev. Lett., 124 (2020) 076601
[4] J.-P. Joost, N. Schlünzen, M. Bonitz, Phys. Rev. B, 101 (2020) 245101