PHYS brown bag seminar: Topological and correlated quantum matter in twisted graphene multilayers

Presenter: Prof. José Lado (Department of Applied Physics)

Abstract:

Two-dimensional materials, and in particular graphene, provide a powerful solid-state platform to create artificial heterostructures, lacking the conventional constraints of lattice match and alignment of bulk compounds. In particular, by controlling the rotation angle between two graphene layers, an emergent structure known as moire pattern appears, dramatically impacting the low energy electronic properties of graphene. Here we will show how the emergent moire pattern in graphene multilayers provides a versatile knob to create controllable electronic states. In particular, we will show how twisted graphene bilayers allow creating topological networks, gauge fields, and tunable correlated states, and we will highlight how these different electronic states can be electrically controlled in experiments. Ultimately, we will show how twisted graphene multilayers provide a powerful platform to realize controllable many-body states, in particular, quantum spin liquids and Kondo insulators.

Join us for science and pizza in the Nanotalo lobby!