Strong Correlation in Magic Angle Graphene
June 7th, 2019 BIKASH K. PADHI KUMAR University of Illinois at Urbana-Champaign

A new chapter in graphene and superconductivity research unfolded recently by the surprising discovery that sheets of graphene, when twisted at certain angles, provide a perfect playground for studying strong-correlation physics, including superconductivity. Although, the electronic properties of each graphene-layer can essentially be described by non-interacting physics, in a twisted bilayer graphene (TBLG) the kinetic energy of the electrons is heavily quenched, causing the interactions to dominate, and thus exhibiting a correlation driven metal-insulator transition. I will attempt at summarizing some of the recent findings in TBLG, and point to some key aspects which hints at the possibility of this transition being a Wigner solidification. Superconductivity is also known to originate by melting such crystals.

Seminar, June 7, 2019, 15:00. ICFO’s Seminar Room

Hosted by Prof. Maciej Lewenstein