Dresden 2017 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 87: Optics and Light-Matter Interaction with Excitons in 2D Materials (joint session HL, DS, O, and TT, organized by DS)
TT 87.1: Vortrag
Freitag, 24. März 2017, 11:15–11:30, CHE 89
Enhanced light-matter interaction in graphene/h-BN van der Waals heterostructures — •Caterina Cocchi1, Wahib Aggoune1,2, Dmitrii Nabok1, Karim Rezouali2, Mohamed Akli Belkhir2, and Claudia Draxl1,2 — 1Institut für Physik und IRIS Adlershof, Humboldt-Universität zu Berlin, Berlin, Germany — 2Laboratoire de Physique Théorique, Faculté des sciences exactes, Université de Bejaia, 06000 Bejaia, Algeria
Investigating the electronic and optical properties of graphene/h-BN heterostructures from first principles, we observe a peculiar nature of their excitations. To this extent, we employ density-functional and many-body perturbation theory in terms of the GW approximation and the Bethe-Salpeter equation. The interaction with h-BN opens a gap in graphene, making the heterostructures semiconducting. These systems absorb light over a broad frequency range, from the near-infrared to the ultraviolet region, exhibiting novel features induced by the stacking. While the specific properties of the building blocks are basically preserved, the inter-layer electron-hole pairs that are formed in the heterostructure can be modulated upon layer patterning. By choosing the stacking arrangement, the electronic coupling between the individual components can be tuned to enhance light-matter interaction. Our results open up perspectives in view of designing new low-dimensional materials with tailored opto-electronic characteristics.