Higher-Order Topology of the Axion Insulator EuIn_{2}As_{2}.
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DOI: 10.1103/physrevlett.122.256402
Abstract: Based on first-principles calculations and symmetry analysis, we propose that EuIn_{2}As_{2} is a long-awaited axion insulator with antiferromagnetic (AFM) long-range order. Characterized by the parity-based invariant Z_{4}=2, the topological magnetoelectric effect is quantized with θ=π… read more here.
Keywords: axion insulator; order; topology; euin ... See more keywords