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SYWH: Symposium Physics of van der Waals 2D heterostructures

SYWH 1: Physics of van der Waals 2D heterostructures

SYWH 1.2: Hauptvortrag

Mittwoch, 18. März 2020, 15:30–16:00, HSZ 02

Flat Bands and Correlated Electronic States in Two Dimensional Atomic Crystals — •Eva Y. Andrei — Department of Physics and Astronomy Rutgers University

Stacking two-dimensional atomic crystals or applying external potentials, can radically change their electronic properties. In particular, it is possible to engineer conditions leading to the creation of flat energy bands, where the quenched kinetic energy provides propitious conditions for the emergence of correlated electronic states. This talk will focus on two such examples: twisted graphene bilayers that develop a flat band at a “magic” twist-angle [1,2], and buckled graphene layers in which a periodically modulated pseudo-magnetic field creates a post-graphene material with flat electronic bands.

[1] Y. Jiang, J. Mao, X. Lai, K. Watanabe, T. Taniguchi, K. Haule, E. Y. Andrei, Charge order and broken rotational symmetry in magic-angle twisted bilayer graphene. Nature 573, 91 (2019)

[2] G. Li, A. Luican, J.M. B. Lopes dos Santos, A. H. Castro Neto, A. Reina, J. Kong and E.Y. Andrei, Observation of Van Hove singularities in twisted graphene layers, Nature Physics 6, 109 (2010)