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Condensed Matter Seminar - "Flat bands and correlated states in atomically thin crystals"

Event Type
Seminar/Symposium
Sponsor
Physics - Condensed Matter
Virtual
wifi event
Date
Apr 2, 2021   1:00 pm  
Speaker
Eva Andrei, Rutgers University
Contact
Stephen Bullwinkel
E-Mail
bullwink@illinois.edu
Phone
217-333-1652
Views
14
Originating Calendar
Physics - Condensed Matter Seminar

The discovery of atomically thin crystals, starting with graphene and followed by dozens in the van der Waals family of compounds, has changed the way we think about materials. This new class of designer materials is making it possible to tune and control electronic properties without changing chemical composition, through alternative means such as superposing different layers, misaligning them, inducing strain, etc. In particular it has become possible to engineer flat bands where the quenched kinetic energy facilitates the formation of correlated electronic states. In this talk I will describe two strategies for realizing flat bands together with experiments that revealed the emergence of correlation induced phases and their non-trivial topology.

  1. Observation of Van Hove singularities in twisted graphene layers, Li, A. Luican, J.M. B. Lopes dos Santos, A. H. Castro Neto, A. Reina, J. Kong and E.Y. Andrei, Nature Physics 6, 109 (2010)
  2. Evidence of Flat Bands and Correlated States in Buckled Graphene Superlattices, Y. Jiang, et al, Nature 584, 215 (2020)
  3. Chern Insulators and Topological Flat-bands in Magic-angle Twisted Bilayer Graphene , Wu, Z. Zhang, K. Watanabe, T. Taniguchi, E. Y. Andrei,  Nature Materials,  (2021)
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