Strain-Induced Quantum Phase Transitions in Magic-Angle Graphene

Daniel E. Parker, Tomohiro Soejima, Johannes Hauschild, Michael P. Zaletel, Nick Bultinck

Publikation: Beitrag in FachzeitschriftArtikelBegutachtung

82 Zitate (Scopus)

Abstract

We investigate the effect of uniaxial heterostrain on the interacting phase diagram of magic-angle twisted bilayer graphene. Using both self-consistent Hartree-Fock and density-matrix renormalization group calculations, we find that small strain values (ϵ∼0.1%-0.2%) drive a zero-temperature phase transition between the symmetry-broken "Kramers intervalley-coherent"insulator and a nematic semimetal. The critical strain lies within the range of experimentally observed strain values, and we therefore predict that strain is at least partly responsible for the sample-dependent experimental observations.

OriginalspracheEnglisch
Aufsatznummer027601
FachzeitschriftPhysical Review Letters
Jahrgang127
Ausgabenummer2
DOIs
PublikationsstatusVeröffentlicht - 9 Juli 2021
Extern publiziertJa

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