Spin waves in magnetic Weyl semimetals
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nuary 2021 Vol. 64 No. 1: 217061 https://doi.org/10.1007/s11433-020-1606-7
Editor’s Focus
Editor’s Focus
Spin waves in magnetic Weyl semimetals Intrinsic magnetic topological materials, namely the stoichiometric magnetic compounds possessing both inherent magnetic order and topological electronic states, have attracted tremendous interest in the research of condensed matter physics and materials science [1]. Such materials not only bring new opportunities to realize many exotic topological phenomena under time-reversal symmetry breaking, but also show great potential in applications of quantum technology [2]. For example, the intrinsic magnetic topological insulators are expected to provide a very clean platform for the quantum anomalous Hall effect, quantized topological magneto-electric effect and chiral Majorana fermions at relatively high temperatures [1,3]. In magnetic Weyl semimetals (MWSMs), the Weyl nodes, as defined by the linearly crossing points between the conduction and valence bands near the Fermi energy, behave as monopoles of Berry curvature with opposite chiralities and thus lift the spin degeneracy [1-4]. The exotic transport properties of bulk MWSMs have been predicted, including the chiral anomaly, gravitational anomaly, intrinsic anomalous Hall effect, anomalous Nernst effect, large magnetoresistance and spin Hall effect [1-5]. Despite these phenomena proved to be strongly related to their static magnetic orders, the role of dynamic spin interactions along with their interplay with topological electron states is not clear yet. So far, several MWSMs have been theoretically proposed, such as SrRuO3, Y2Ir2O7, HgCr2Se4, and Co2TiGe [6], but most of them need to be further verified by surface spectroscopic probes. In 2018, a ferromagnetic Shandite compound Co3Sn2S2 was identified as an ideal MWSM with a very promising anomalous Hall conductivity and anomalous Hall angle in comparison with other typical magnetic systems [7]. In a recent study, Liu et al. [8] from the Institute of Physics, Chinese Academy of Sciences, explored the low-energy spin waves in Co3Sn2S2 single crystals via inelastic neutron scattering experiments at the Australian Centre for Neutron Scattering, ANSTO. They discovered three-dimensional spin excitations with clear in-plane and c-axis dispersions in both the ferromagnetic state (T=8 K
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