Paper Image

Demystifying magic-angle graphene: How optical cavities can stabilize exotic phases

Published on:

8 June 2023

Primary Category:

Mesoscale and Nanoscale Physics

Paper Authors:

Cunyuan Jiang,

Matteo Baggioli,

Qing-Dong Jiang

Bullets

Key Details

Chiral optical cavities can stabilize flat bands in twisted bilayer graphene away from magic angle

Time-reversal symmetry breaking by the cavity is key to flattening and isolating the bands

Quasi-flat bands achieved from 0.8° to 1.3° twist angle with realistic light-matter coupling

Proposed cavity setup extends exotic phases in graphene superlattices beyond fragile magic angle

Combining photonics and twistronics is a new knob to engineer topological materials

AI generated summary

Demystifying magic-angle graphene: How optical cavities can stabilize exotic phases

This paper shows that exotic electronic phases in twisted bilayer graphene, like superconductivity, can be stabilized over a wider range of twist angles by embedding the material in a chiral optical cavity. The cavity's breaking of time-reversal symmetry flattens the electronic bands and isolates them from the rest of the spectrum. This effect persists from 0.8° to 1.3° twist angle, moving beyond the fragile 'magic angle' of 1.05° where exotic phases normally occur. The proposed cavity coupling provides a route to engineer topological flat bands and strongly-correlated physics in graphene superlattices.

Answers from this paper

Comments

No comments yet, be the first to start the conversation...

Sign up to comment on this paper

Sign Up