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 Co3Sn2S2. 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.
Highlights
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
The intrinsic anomalous Hall effect (AHE) has been considered to exhibit the prominent feature in the optical Hall conductivity spectra σxy(ω); the interband optical transition on the topological electronic structure with the Berry curvature gives rise to the resonant structure in σxy(ω)[22,23,24,25,26]
We introduce an archetypal theoretical model for understanding the optical Hall conductivity spectra owing to the intrinsic AHE (Fig. 1a)[23]; the two-dimensional electronic structure has a single anti-crossing point with the mass gap 2 m, and the chemical potential μ is defined as the energy distance from the Weyl point
Summary
When the spin–orbit interaction is taken into account, this nodal ring structure almost opens a gap with anticrossing lines except for the pairs of the Weyl points (Fig. 1d, right) These topological electronic states including the Fermi arc are observed in the recent ARPES study, demonstrating that Co3Sn2S2 is a novel example of the magnetic WSM20. To consider the electron correlation effect, we introduced the renormalization factor of 1.52 and that the energy was divided by this factor for all theoretical spectra; this treatment is a 200
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