3 years ago

Antiferromagnetic Chern insulators in non-centrosymmetric systems.

Ziqiang Wang, Xi Dai, Sen Zhou, Kun Jiang

We investigate a new class of topological antiferromagnetic (AF) Chern insulators driven by electronic interactions in two-dimensional systems without inversion symmetry. Despite the absence of a net magnetization, the AF Chern insulators (AFCI) possess a nonzero Chern number $C$ and exhibit the quantum anomalous Hall effect (QAHE) due to spontaneous time-reversal symmetry breaking. Their existence is guaranteed by the bifurcation of the boundary line of Weyl points between a quantum spin Hall insulator and a topologically trial phase for sufficiently strong correlation and the emergence of AF long-range order. As a concrete example, we study the phase structure of the honeycomb lattice Kane-Mele model as a function of the inversion-breaking ionic potential $\Delta$ and the Hubbard interaction $U$. We find an easy $z$-axis $C=1$ AFCI phase and a spin-flop transition to a topologically trial $xy$-plane collinear antiferromagnet. We propose possible experimental realizations of the AFCI and QAHE in correlated electron materials and cold atom systems.

Publisher URL: http://arxiv.org/abs/1710.05035

DOI: arXiv:1710.05035v2

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