Current-Driven Magnetization Reversal in Orbital Chern Insulators

Chunli Huang, Nemin Wei, Allan H. Macdonald

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

Graphene multilayers with flat moiré minibands can exhibit the quantized anomalous Hall effect due to the combined influence of spontaneous valley polarization and topologically nontrivial valley-projected bands. The sign of the Hall effect in these Chern insulators can be reversed either by applying an external magnetic field, or by driving a transport current through the system. We propose a current-driven mechanism whereby reversal occurs along lines in the (current I, magnetic-field B) control parameter space with slope dI/dB=(e/h)MAM(1-γ2)/γ, where M is the magnetization, AM is the moiré unit cell area, and γ<1 is the ratio of the chemical potential difference between valleys along a domain wall to the electrical bias eV.

Original languageEnglish
Article number056801
JournalPhysical Review Letters
Volume126
Issue number5
DOIs
StatePublished - Feb 2 2021

Bibliographical note

Publisher Copyright:
© 2021 American Physical Society.

ASJC Scopus subject areas

  • General Physics and Astronomy

Fingerprint

Dive into the research topics of 'Current-Driven Magnetization Reversal in Orbital Chern Insulators'. Together they form a unique fingerprint.

Cite this