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  • Title: Chern semimetal and the quantized anomalous Hall effect in HgCr2Se4.
    Author: Xu G, Weng H, Wang Z, Dai X, Fang Z.
    Journal: Phys Rev Lett; 2011 Oct 28; 107(18):186806. PubMed ID: 22107665.
    Abstract:
    In 3D momentum space, a topological phase boundary separating the Chern insulating layers from normal insulating layers may exist, where the gap must be closed, resulting in a "Chern semimetal" state with topologically unavoidable band crossings at the Fermi level. This state is a condensed-matter realization of Weyl fermions in (3+1)D, and should exhibit remarkable features, such as magnetic monopoles and Fermi arcs. Here we predict, based on first principles calculations, that such a novel quantum state can be realized in a known ferromagnetic compound HgCr2Se4, with a single pair of Weyl fermions separated in momentum space. The quantum Hall effect without an external magnetic field can be achieved in its quantum-well structure.
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