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Protection of flat bands in twisted graphene

Published on:

28 March 2024

Primary Category:

Mesoscale and Nanoscale Physics

Paper Authors:

Valentin Crépel,

Peize Ding,

Nishchhal Verma,

Nicolas Regnault,

Raquel Queiroz

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Key Details

First magic angle flat band topologically protected

Originates from hidden non-local symmetry

Allows to decompose problem in two sectors

Higher magic angles not protected, hard to observe

AI generated summary

Protection of flat bands in twisted graphene

This paper investigates the stability of flat bands in twisted bilayer graphene and transition metal dichalcogenides. It finds the first magic angle benefits from a topological protection mechanism against disorder, similar to that protecting the zeroth Landau level of Dirac fermions. This protection originates from a hidden symmetry allowing to decompose the problem into two decoupled sectors. Higher magic angles lack this protection and should be impossible to observe experimentally.

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