論文

2021年10月

Magnetism of magic-angle twisted bilayer graphene

SCIPOST PHYSICS
  • Javad Vahedi
  • ,
  • Robert Peters
  • ,
  • Ahmed Missaoui
  • ,
  • Andreas Honecker
  • ,
  • Guy Trambly de Laissardiere

11
4
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.21468/SciPostPhys.11.4.083
出版者・発行元
SCIPOST FOUNDATION

We investigate magnetic instabilities in charge-neutral twisted bilayer graphene close to so-called "magic angles" using a combination of real-space Hartree-Fock and dynamical mean-field theories. In view of the large size of the unit cell close to magic angles, we examine a previously proposed rescaling that permits to mimic the same underlying flat minibands at larger twist angles. We find that localized magnetic states emerge for values of the Coulomb interaction U that are significantly smaller than what would be required to render an isolated layer antiferromagnetic. However, this effect is overestimated in the rescaled system, hinting at a complex interplay of flatness of the minibands close to the Fermi level and the spatial extent of the corresponding localized states. Our findings shed new light on perspectives for experimental realization of magnetic states in charge-neutral twisted bilayer graphene.

リンク情報
DOI
https://doi.org/10.21468/SciPostPhys.11.4.083
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000717465100007&DestApp=WOS_CPL
ID情報
  • DOI : 10.21468/SciPostPhys.11.4.083
  • ISSN : 2542-4653
  • Web of Science ID : WOS:000717465100007

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