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  • Title: Magnetic Semimetals and Quantized Anomalous Hall Effect in EuB_{6}.
    Author: Nie S, Sun Y, Prinz FB, Wang Z, Weng H, Fang Z, Dai X.
    Journal: Phys Rev Lett; 2020 Feb 21; 124(7):076403. PubMed ID: 32142316.
    Abstract:
    Exploration of the novel relationship between magnetic order and topological semimetals has received enormous interest in a wide range of both fundamental and applied research. Here we predict that "soft" ferromagnetic material EuB_{6} can achieve multiple topological semimetal phases by simply tuning the direction of the magnetic moment. Explicitly, EuB_{6} is a topological nodal-line semimetal when the moment is aligned along the [001] direction, and it evolves into a Weyl semimetal with three pairs of Weyl points by rotating the moment to the [111] direction. Interestingly, we identify a composite semimetal phase featuring the coexistence of a nodal line and Weyl points with the moment in the [110] direction. Topological surface states and anomalous Hall conductivity, which are sensitive to the magnetic order, have been computed and are expected to be experimentally observable. Large-Chern-number quantum anomalous Hall effect can be realized in its [111]-oriented quantum-well structures.
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