Regensburg 2019 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
O: Fachverband Oberflächenphysik
O 14: Graphene II: Excitations and Nanoribbons (joint session O/TT)
O 14.12: Vortrag
Montag, 1. April 2019, 17:45–18:00, H24
Dielectric engineering in twisted bilayer graphene — •Jose Pizarro1, Malte Rösner2, Ronny Thomale3, and Tim Wehling1 — 1Universität Bremen — 2University of Southern California — 3Universität Würzburg
Twisted bilayer graphene (TBG) has appeared as a tunable testing ground to investigate the conspiracy of electronic interactions, band structure, and lattice degrees of freedom to yield exotic quantum many-body ground states in a two-dimensional semiconductor framework. While the impact of external parameters such as doping or magnetic field can be conveniently modified and analyzed, the lack of open accessiblity of the quasi-2D electron gas combined with its intricate internal properties pose a challenging task to characterize the quintessential nature of the different insulating and superconducting states found in transport experiments. We analyze the possible role of the dielectric environment for TBG on the internal electronic interaction profile, which could be conveniently adjusted in experiment, e.g. by varying the capping layer composition and thickness. We find that this allows to significantly modify the internal interaction strength. In doing so, we propose the experimental tailoring of the dielectric environment as a promising pursuit to provide further evidence for resolving the hidden nature of quantum many-body states in TBG.