Berlin 2018 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 99: Poster Session: Transport

TT 99.14: Poster

Donnerstag, 15. März 2018, 15:00–19:00, Poster B

Light-Driven Dynamics in Finite Graphene Nanostructures — •Jan-Philip Joost, Niclas Schlünzen, and Michael Bonitz — CAU Kiel, Germany

The understanding of carrier multiplication effects in nanoscale graphene structures is essential for various applications including solar energy harvesting [1]. In this work, we observe impact excitation effects within a few femtoseconds after an optical laser pulse excitation. The finite graphene clusters, such as nanoribbons, are described using an extended Hubbard model that takes into account the overlap of adjacent orbitals and hopping between up to third nearest neighbors. The system dynamics is provided by a nonequilibrium Green functions [2] (NEGF) approach, that has been thoroughly tested against DMRG [3], combined with the second Born (SOA) and GW selfenergy to account for electron correlations. Our description allows to predict the correlated nonequilibrium dynamics of excited graphene nanostructures of arbitrary geometry containing up to 100 carbon atoms for up to 25 fs.
[1] N. M. Gabor, Acc. Chem. Res. 46(6) 1348 (2013)
[2] K. Balzer and M. Bonitz, Lect. Notes Phys. 867 (2013)
[3] N. Schlünzen, J.-P. Joost, F. Heidrich-Meisner, and M. Bonitz, Phys. Rev B 95, 165139 (2017)