TY - JOUR
T1 - Current-Driven Magnetization Reversal in Orbital Chern Insulators
AU - Huang, Chunli
AU - Wei, Nemin
AU - Macdonald, Allan H.
N1 - Publisher Copyright:
© 2021 American Physical Society.
PY - 2021/2/2
Y1 - 2021/2/2
N2 - 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.
AB - 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.
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U2 - 10.1103/PhysRevLett.126.056801
DO - 10.1103/PhysRevLett.126.056801
M3 - Article
C2 - 33605773
AN - SCOPUS:85100996326
SN - 0031-9007
VL - 126
JO - Physical Review Letters
JF - Physical Review Letters
IS - 5
M1 - 056801
ER -