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Okamura, Y; Minami, S; Kato, Y; Fujishiro, Y; Kaneko, Y; Ikeda, J; Muramoto, J; Kaneko, R; Ueda, K; Kocsis, V; Kanazawa, N; Taguchi, Y; Koretsune, T; Fujiwara, K; Tsukazaki, A; Arita, R; Tokura, Y; Takahashi, Y
Nature communications, 09/2020, Volume: 11, Issue: 1Journal Article
Abstract The Weyl semimetal (WSM), which hosts pairs of Weyl points and accompanying Berry curvature in momentum space near Fermi level, is expected to exhibit novel electromagnetic phenomena. Although the large optical/electronic responses such as nonlinear optical effects and intrinsic anomalous Hall effect (AHE) have recently been demonstrated indeed, the conclusive evidence for their topological origins has remained elusive. Here, we report the gigantic magneto-optical (MO) response arising from the topological electronic structure with intense Berry curvature in magnetic WSM Co 3 Sn 2 S 2 . The low-energy MO spectroscopy and the first-principles calculation reveal that the interband transitions on the nodal rings connected to the Weyl points show the resonance of the optical Hall conductivity and give rise to the giant intrinsic AHE in dc limit. The terahertz Faraday and infrared Kerr rotations are found to be remarkably enhanced by these resonances with topological electronic structures, demonstrating the novel low-energy optical response inherent to the magnetic WSM.
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