Electrically Tunable Gauge Fields in Tiny-Angle Twisted Bilayer Graphene

Aline Ramires and Jose L. Lado
Phys. Rev. Lett. 121, 146801 – Published 1 October 2018
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Abstract

Twisted bilayer graphene has recently attracted a lot of attention for its rich electronic properties and tunability. Here we show that for very small twist angles, α1°, the application of a perpendicular electric field is mathematically equivalent to a new kind of artificial gauge field. This identification opens the door for the generation and detection of pseudo-Landau levels in graphene platforms within robust setups, which do not depend on strain engineering and therefore can be realistically harvested for technological applications. Furthermore, this new artificial gauge field leads to the development of highly localized modes associated with flat bands close to charge neutrality, which form an emergent kagome lattice in real space. Our findings indicate that for tiny angles biased twisted bilayer graphene is a promising platform that can realize frustrated lattices of highly localized states, opening a new direction for the investigation of strongly correlated phases of matter.

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  • Received 20 March 2018

DOI:https://doi.org/10.1103/PhysRevLett.121.146801

© 2018 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Aline Ramires1,* and Jose L. Lado2

  • 1Institute for Theoretical Studies, ETH Zurich, 8092 Zurich, Switzerland
  • 2Institute for Theoretical Physics, ETH Zurich, 8093 Zurich, Switzerland

  • *Present address: ICTP South American Institute for Fundamental Research, Instituto de Física Teórica, UNESP, 01140-070 São Paulo, Brazil. aline.ramires@ictp-saifr.org

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Issue

Vol. 121, Iss. 14 — 5 October 2018

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