Sketch of realizing topological magnetoelectric effect in triangular ferromagnetic MnBi2Te4 (IMAGE)
Caption
(a) Sketch of a 3D spherical TI with hedgehog-like surface magnetization and (b) the cylindrical TI with radial magnetic orbital moment, both of them are hard to be realizing in the experiment due to the complex magnetic configuration. (c) The spherical 3D TI with FM magnetization, where two hemispheres form two domains with a gapless chiral mode (yellow line). Electric field cannot generate a net magnetization as the contributions from two domains compensate each other. (d) Ferromagnetic MnBi2Te4 of triangular prism, where the side surfaces are gapped due to the hexagonal warping effect. A net electric field induced bulk magnetization is predicted.
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