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  • Title: Observation of Weyl fermions in a magnetic non-centrosymmetric crystal.
    Author: Sanchez DS, Chang G, Belopolski I, Lu H, Yin JX, Alidoust N, Xu X, Cochran TA, Zhang X, Bian Y, Zhang SS, Liu YY, Ma J, Bian G, Lin H, Xu SY, Jia S, Hasan MZ.
    Journal: Nat Commun; 2020 Jul 03; 11(1):3356. PubMed ID: 32620859.
    Abstract:
    The absence of inversion symmetry in non-centrosymmetric materials has a fundamental role in the emergence of a vast number of fascinating phenomena, like ferroelectricity, second harmonic generation, and Weyl fermions. The removal of time-reversal symmetry in such systems further extends the variety of observable magneto-electric and topological effects. Here we report the striking topological properties in the non-centrosymmetric spin-orbit magnet PrAlGe by combining spectroscopy and transport measurements. By photoemission spectroscopy below the Curie temperature, we observe topological Fermi arcs that correspond to projected topological charges of ±1 in the surface Brillouin zone. In the bulk, we observe the linear energy-dispersion of the Weyl fermions. We further observe a large anomalous Hall response in our magneto-transport measurements, which is understood to arise from diverging bulk Berry curvature fields associated with the Weyl band structure. These results establish a novel Weyl semimetal phase in magnetic non-centrosymmetric PrAlGe.
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