Time and place: 2019.3.29, 15:00 pm, Wuhan National High Magnetic Field Center B206

Presenter: Enke Liu

Title: Topologically Enhanced Transverse Electronic Transport Effects in Magnetic Weyl Semimetal Co₃Sn₂S₂

Abstract：

Topological physical states originating from non-trivial band characters in momentum space have motivated increasing interests in the condense matter physics. The magnetic Weyl semimetals with magnetic monopoles of Berry curvature is expected to generate the gaint, intrinsic transverse transport effects. In this talk, I will present a quasi-two-dimensional, kagome-lattice magnetic Weyl semimetal Co₃Sn₂S₂. The chiral-anomaly-induced negative magnetoresistance, ARPES and STM observations provide signatures of Weyl fermions in Co₃Sn₂S₂. The intrinsic properties including anomalous Hall conductivity, anomalous Hall angle, anomalous Nernst effect, and transverse thermoelectric conductivity are observed experimentally to reach up to an order of magnitudes larger than common magnetic systems. Our study establishes kagome-lattice magnetic Weyl semimetal with an out-of-plane ferromagnetic order as a key class of materials for fundamental research and device applications under the connection of topological physics and spintronics/spin-caloritronics.