Local twist-angle maps in magic-angle twisted bilayer graphene reveal 0.1-degree variations and gradients that generate unscreened electric fields and bulk quantum Hall edge states.
Designing Flat Band by Strain
1 Pith paper cite this work. Polarity classification is still indexing.
1
Pith paper citing it
abstract
We study the effects of heterostrain on moir\'e bands in twisted bilayer graphene and bilayer transition metal dichalcogenide (TMD) systems. For bilayer graphene with twist angle near $1^\circ$, we show that heterostrain significantly increases the energy separation between conduction and valence bands as well as the Dirac velocity at charge neutrality, which resolves several puzzles in scanning tunneling spectroscopy and quantum oscillation experiments at once. For bilayer TMD, we show that applying small heterostrain generally leads to flat moir\'e bands that are highly tunable.
fields
cond-mat.mes-hall 1years
2019 1verdicts
CONDITIONAL 1representative citing papers
citing papers explorer
-
Mapping the twist angle and unconventional Landau levels in magic angle graphene
Local twist-angle maps in magic-angle twisted bilayer graphene reveal 0.1-degree variations and gradients that generate unscreened electric fields and bulk quantum Hall edge states.