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  4. Unconventional Flat Chern Bands and 2e Charges in Skyrmionic Moire Superlattices
 
research article

Unconventional Flat Chern Bands and 2e Charges in Skyrmionic Moire Superlattices

Guan, Yifei  
•
Yazyev, Oleg V.  
•
Kruchkov, Alexander
May 3, 2023
Nano Letters

The interplay of topological characteristics in real space and reciprocal space can lead to the emergence of unconventional topological phases. In this Letter, we implement a novel mechanism for generating higher-Chern flat bands on the basis of twisted bilayer graphene (TBG) coupled to topological magnetic structures in the form of the skyrmion lattice. In particular, we discover a scenario for generating vertical bar C vertical bar = 2 dispersionless electronic bands when the skyrmion periodicity and the moire ' periodicity match. Following the Wilczek argument, the statistics of the charge-carrying excitations in this case is bosonic, characterized by electronic charge Q = 2e, which is even in units of electron charge e. The skyrmion coupling strength triggering the topological phase transition is realistic, with its lower bound estimated as 4 meV. The Hofstadter butterfly spectrum results in an unexpected quantum Hall conductance sequence +/- 2e(2)/h, +/- 4e(2)/h, ... for TBG with the skyrmion order.

  • Details
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Type
research article
DOI
10.1021/acs.nanolett.3c00121
Web of Science ID

WOS:000985742200001

Author(s)
Guan, Yifei  
Yazyev, Oleg V.  
Kruchkov, Alexander
Date Issued

2023-05-03

Publisher

AMER CHEMICAL SOC

Published in
Nano Letters
Volume

23

Issue

10

Start page

4209

End page

4215

Subjects

Chemistry, Multidisciplinary

•

Chemistry, Physical

•

Nanoscience & Nanotechnology

•

Materials Science, Multidisciplinary

•

Physics, Applied

•

Physics, Condensed Matter

•

Chemistry

•

Science & Technology - Other Topics

•

Materials Science

•

Physics

•

twisted bilayer graphene

•

moire lattice relaxation

•

skyrmions

•

flat electronic bands

•

hybrid wannier functions

•

quantum hall effect

•

bloch electrons

•

dirac fermions

•

quantum

•

superconductivity

•

polarization

•

spin

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
C3MP  
Available on Infoscience
July 3, 2023
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/198707
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