Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 26: Focus Session: Designer Quantum Systems I (joint session O/TT)

O 26.1: Hauptvortrag

Dienstag, 2. April 2019, 10:30–11:00, H15

Imaging Electronic Correlations in Twisted Bilayer Graphene — •Stevan Nadj-Perge — California Institute of Technology, Pasadena, CA, USA

Twisted bilayer graphene with a twist angle close to 1° features isolated flat electronic bands that form a strongly correlated electronic system. Here we investigate properties of this system by probing local tunneling density of states using scanning tunneling microscopy and spectroscopy. We show that the flat bands get deformed when they are aligned with the Fermi level using electrostatic gating. Careful characterization of the bands allows us to estimate energy scale of electron-electron interactions. Our results provide basis for microscopic understanding of correlated quantum phases in small angle twisted bilayer graphene.