Reversing outermost septuple-layer spin alignments in 6-SL MnBi2Te4 switches from C=0 axion insulator with vanishing Faraday rotation to C=1 Chern insulator with quantized MO response, independent of PT symmetry and net magnetization.
Z.; Guo, Z.; Xu, Z.; Wang, J.; Chen, X
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Topological Magneto-Optical Switching in Even-Layered MnBi$_2$Te$_4$
Reversing outermost septuple-layer spin alignments in 6-SL MnBi2Te4 switches from C=0 axion insulator with vanishing Faraday rotation to C=1 Chern insulator with quantized MO response, independent of PT symmetry and net magnetization.