Work

Optically induced flat bands in twisted bilayer graphene

Year: 2020

Type: article

Abstract: Twisted bilayer graphene exhibits strong electronic correlations at the ``magic angle'' -- a special angle of the twist, at which isolated flat bands emerge in the material's band structure. The authors present here a new mechanism to induce isolated flat bands at angles below the magic angle using visible/infrared light. This mechanism enables optical control of the flatness, spectral isolation, and topological properties of the bands, using frequencies which are well below the material's bandwidth. Floquet engineering using optical fields and moir\'e superlattices may therefore play an important role in the exploration of on-demand nonequilibrium quantum phases of matter.

Source: Physical review. B./Physical review. B

DOI: 10.1103/physrevb.102.155123

Authors: Or Katz, Gil Refael, Netanel H. Lindner

Institutions: Rafael Advanced Defense Systems (Israel), Technion – Israel Institute of Technology, Weizmann Institute of Science, California Institute of Technology

Language: English

Topic: Graphene research and applications

Subfield: Materials Chemistry

Field: Materials Science

Domain: Physical Sciences

Open Access status: green

Funders: National Science Foundation, Gordon and Betty Moore Foundation, Horizon 2020, Army Research Office

Awards: G1707509607, Quantum dynamics in driven and disordered systems: Floquet topological control and flow methods for many body localization, G7480252223, Programs on Critical Problems in Physics, Astrophysics and Biophysics at the Aspen Center for Physics