The Curious Magnetic Properties of Orbital Chern Insulators
ORAL
Abstract
Chern insulator ferromagnets are characterized by a quantized anomalous Hall effect, and have so far been identified experimentally in magnetically-doped topological insulator (MTI) thin films and in bilayer graphene moiré superlattices. We classify Chern insulator ferromagnets as either spin or orbital, depending on whether the orbital magnetization results from spontaneous spin-polarization combined with spin-orbit interactions, as in the MTI case, or directly from spontaneous orbital currents, as in the moiré superlattice case. We argue that in a given magnetic state, characterized for example by the
sign of the anomalous Hall effect, the magnetization of an orbital Chern insulator will often have opposite signs for weak n and weak p electrostatic or chemical doping. This property enables pure electrical switching of a magnetic state in the presence of a fixed magnetic field.
sign of the anomalous Hall effect, the magnetization of an orbital Chern insulator will often have opposite signs for weak n and weak p electrostatic or chemical doping. This property enables pure electrical switching of a magnetic state in the presence of a fixed magnetic field.
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Presenters
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Jihang Zhu
University of Texas at Austin, The University of Texas at Austin, Department of Physics, The University of Texas at Austin
Authors
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Jihang Zhu
University of Texas at Austin, The University of Texas at Austin, Department of Physics, The University of Texas at Austin
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Allan Macdonald
University of Texas at Austin, Department of Physics, The University of Texas at Austin, Physics department, University of Texas at Austin, The University of Texas at Austin