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Designing Flat Band by Strain

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arxiv 1902.10146 v1 pith:UUFDM2EZ submitted 2019-02-26 cond-mat.mtrl-sci cond-mat.str-el

Zhen Bi , Noah F. Q. Yuan , Liang Fu This is my paper · ORCID
classification cond-mat.mtrl-scicond-mat.str-el
keywords bilayerbandsheterostrainflatgraphenemoirangleapplying
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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.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Mapping the twist angle and unconventional Landau levels in magic angle graphene

    cond-mat.mes-hall 2019-08 conditional novelty 8.0 of 10

    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.

  2. Disorder in Twisted Bilayer Graphene

    cond-mat.dis-nn 2019-08 conditional novelty 7.0 of 10

    Twist-angle disorder in twisted bilayer graphene fills in miniband gaps and broadens the miniband, while leaving the Dirac cone velocity almost unchanged.

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