Regensburg 2019 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

TT: Fachverband Tiefe Temperaturen

TT 64: Poster Session: Transport

TT 64.15: Poster

Donnerstag, 4. April 2019, 15:00–18:30, Poster D

Correlation Effects on the Electronic Structure of Graphene Nanoribbon Heterojunctions — •Jan-Philip Joost, Niclas Schlünzen, and Michael Bonitz — Institute of Theoretical Physics and Astrophysics, Kiel University, 24098 Kiel, Germany

Due to their tunable band gap graphene nanoribbons (GNRs) emerged as a promising candidate for various applications in nanoelectronics and optoelectronics [1]. Compared to macroscopic graphene, in GNRs electron–electron correlations are enhanced by the quantum confinement of the electrons. An accurate description, therefore, has to go beyond the often used mean-field approaches [2]. Here, we decribe the GNRs using an extended Hubbard model that improves the common tight-binding models by taking into account electron–electron interactions. The model is solved by a nonequilibrium Green functions [3] (NEGF) approach combined with the GW self-energy to account for electron correlations. As a particular application we study the electronic structure of GNR heterojunctions and compare to the experimental observations of Ref. [4].
J. P. Llinas et al., Nat. Commun. 8, 633 (2017)
J.-P. Joost et al., Phys. Status Solidi B, in press
K. Balzer and M. Bonitz, Lect. Notes Phys. 867 (2013)
D. J. Rizzo et al., Nature 560, 204 (2018)