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Jennifer Cano (Stony Brook)

Date: Mon. April 18th, 2022, 12:45 pm-1:45 pm
Location: via Zoom

Topological Twistronics
Jennifer Cano 
Department of Physics and Astronomy, Stony Brook University
Abstract.— Twisting van der Waals heterostructures to induce correlated many-body states provides a novel tuning mechanism in solid-state physics, launching the field of “twistronics.” In this talk, we apply twistronics to renormalize the Dirac cone on the surface of a 3D topological insulator, with the goal of realizing tunable interacting topological phases. To achieve this goal, we consider two different platforms: 1) twisted heterostructures in 2D and 3D; and 2) the effect of a moire superlattice potential. In all cases, we consider the renormalization of the non-interacting band structure, specifically, whether magic angles are possible and where van Hove singularities appear. Finally, we show that interactions drive a magnetic instability on the surface of a TI in the presence of a superlattice potential, resulting in a novel skyrmion lattice.

Host: Shulei Zhang

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