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- W4308207629 abstract "An antiferromagnetic Chern insulator (AFCI) can exist if the effect of the time-reversal transformation on the electronic state cannot be compensated by a space-group operation. The AFCI state with collinear magnetic order is already realized in noncentrosymmetric honeycomb structures through the Kane-Mele-Hubbard model. In this paper, we demonstrate the existence of the collinear AFCI in a square-lattice model which preserves the inversion symmetry. Our study relies on the time-reversal-invariant Harper-Hofstadter-Hubbard model extended by a next-nearest-neighbor hopping term including spin-orbit coupling and a checkerboard potential. We show that an easy $z$-axis AFCI appears between the band insulator at weak and the easy $xy$-plane AF Mott insulator at strong Hubbard repulsion provided the checkerboard potential is large enough. The close similarity between our results and the results obtained for the noncentrosymmetric Kane-Mele-Hubbard model suggests the AFCI as a generic consequence of spin-orbit coupling and strong electronic correlation which exists beyond a specific model or lattice structure. An AFCI with the electronic and the magnetic properties originating from the same strongly interacting electrons is a promising candidate for a strong magnetic blueshift of the charge gap below the N'eel temperature and for realizing the quantum anomalous Hall effect at higher temperatures so that applications for data processing become possible." @default.
- W4308207629 created "2022-11-09" @default.
- W4308207629 creator A5003571884 @default.
- W4308207629 creator A5014502160 @default.
- W4308207629 creator A5035653147 @default.
- W4308207629 creator A5036808638 @default.
- W4308207629 date "2022-11-04" @default.
- W4308207629 modified "2023-09-23" @default.
- W4308207629 title "Antiferromagnetic Chern insulator in centrosymmetric systems" @default.
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