---
_id: '10692'
abstract:
- lang: eng
  text: We experimentally investigate narrow and topologically nontrivial moiré minibands
    hosted by van der Waals heterostructures consisting of a graphene monolayer rotationally
    faulted with respect to a Bernal-stacked bilayer. At fillings ν= 1 and 3 electrons
    per moiré unit cell within these bands, we observe quantized anomalous Hall effects
    with Rxy≈h/2e2, indicative of spontaneous polarization of the system into a single
    valley-projected band with Chern number C= 2. Remarkably, we also observe the
    evidence of symmetry broken Chern insulator states at ν= 1.5 and 3.5. At ν= 3
    we find that the sign of the quantum anomalous Hall effect can be reversed via
    field-effect control of the chemical potential. This curious effect arises from
    the magnetization contribution due to topological edge states, which drive a reversal
    of the total magnetization and thus a switch of the favored magnetic state. Remarkably,
    we find that this switch is hysteretic, which we use to demonstrate non-volatile
    electric-field-induced reversal of the magnetic state. Voltage control of magnetic
    states can be used to electrically pattern nonvolatile magnetic domain structures
    hosting chiral edge states, with applications ranging from reconfigurable microwave
    circuit elements to ultra-low-power magnetic memory.
alternative_title:
- Bulletin of the American Physical Society
article_number: E42.00010
article_processing_charge: No
author:
- first_name: Hryhoriy
  full_name: Polshyn, Hryhoriy
  id: edfc7cb1-526e-11ec-b05a-e6ecc27e4e48
  last_name: Polshyn
  orcid: 0000-0001-8223-8896
- first_name: Jihang
  full_name: Zhu, Jihang
  last_name: Zhu
- first_name: Manish
  full_name: Kumar, Manish
  last_name: Kumar
- first_name: Yuxuan
  full_name: Zhang, Yuxuan
  last_name: Zhang
- first_name: Fangyuan
  full_name: Yang, Fangyuan
  last_name: Yang
- first_name: Charles
  full_name: Tschirhart, Charles
  last_name: Tschirhart
- first_name: Marec
  full_name: Serlin, Marec
  last_name: Serlin
- first_name: Kenji
  full_name: Watanabe, Kenji
  last_name: Watanabe
- first_name: Takashi
  full_name: Tanaguchi, Takashi
  last_name: Tanaguchi
- first_name: Allan
  full_name: MacDonald, Allan
  last_name: MacDonald
- first_name: Andrea
  full_name: Young, Andrea
  last_name: Young
citation:
  ama: 'Polshyn H, Zhu J, Kumar M, et al. Orbital Chern insulator states in twisted
    monolayer-bilayer graphene and electrical switching of topological and magnetic
    order. In: <i>APS March Meeting 2021</i>. Vol 66. American Physical Society; 2021.'
  apa: 'Polshyn, H., Zhu, J., Kumar, M., Zhang, Y., Yang, F., Tschirhart, C., … Young,
    A. (2021). Orbital Chern insulator states in twisted monolayer-bilayer graphene
    and electrical switching of topological and magnetic order. In <i>APS March Meeting
    2021</i> (Vol. 66). Virtual: American Physical Society.'
  chicago: Polshyn, Hryhoriy, Jihang Zhu, Manish Kumar, Yuxuan Zhang, Fangyuan Yang,
    Charles Tschirhart, Marec Serlin, et al. “Orbital Chern Insulator States in Twisted
    Monolayer-Bilayer Graphene and Electrical Switching of Topological and Magnetic
    Order.” In <i>APS March Meeting 2021</i>, Vol. 66. American Physical Society,
    2021.
  ieee: H. Polshyn <i>et al.</i>, “Orbital Chern insulator states in twisted monolayer-bilayer
    graphene and electrical switching of topological and magnetic order,” in <i>APS
    March Meeting 2021</i>, Virtual, 2021, vol. 66, no. 1.
  ista: 'Polshyn H, Zhu J, Kumar M, Zhang Y, Yang F, Tschirhart C, Serlin M, Watanabe
    K, Tanaguchi T, MacDonald A, Young A. 2021. Orbital Chern insulator states in
    twisted monolayer-bilayer graphene and electrical switching of topological and
    magnetic order. APS March Meeting 2021. APS: American Physical Society, Bulletin
    of the American Physical Society, vol. 66, E42.00010.'
  mla: Polshyn, Hryhoriy, et al. “Orbital Chern Insulator States in Twisted Monolayer-Bilayer
    Graphene and Electrical Switching of Topological and Magnetic Order.” <i>APS March
    Meeting 2021</i>, vol. 66, no. 1, E42.00010, American Physical Society, 2021.
  short: H. Polshyn, J. Zhu, M. Kumar, Y. Zhang, F. Yang, C. Tschirhart, M. Serlin,
    K. Watanabe, T. Tanaguchi, A. MacDonald, A. Young, in:, APS March Meeting 2021,
    American Physical Society, 2021.
conference:
  end_date: 2021-03-19
  location: Virtual
  name: 'APS: American Physical Society'
  start_date: 2021-03-15
date_created: 2022-01-27T09:49:48Z
date_published: 2021-03-01T00:00:00Z
date_updated: 2022-01-27T10:46:23Z
day: '01'
extern: '1'
intvolume: '        66'
issue: '1'
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://meetings.aps.org/Meeting/MAR21/Session/E42.10
month: '03'
oa: 1
oa_version: Published Version
publication: APS March Meeting 2021
publication_identifier:
  issn:
  - 0003-0503
publisher: American Physical Society
quality_controlled: '1'
status: public
title: Orbital Chern insulator states in twisted monolayer-bilayer graphene and electrical
  switching of topological and magnetic order
type: conference
user_id: 8b945eb4-e2f2-11eb-945a-df72226e66a9
volume: 66
year: '2021'
...