SKM 2021 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 21: Focus Session: Topological Kagome Metals
TT 21.4: Vortrag
Donnerstag, 30. September 2021, 15:00–15:30, H7
Study on the Magnetic Weyl Semimetal Phase in Kagome Lattice, Co3Sn2S2 — •Defa Liu — Max Planck Insititute of Microstructure Physics
Materials with kagome lattice attract lots of investigations recently as they can realize many exotic phases and properties, such as the existence of flat band,superconductivity, CDW order, topological Dirac semimetal and Weyl semimetal phases, which can provide an ideal platform to study the interplay between them. Among the kagome materials, the ferromagnetic Co3Sn2S2 has many exotic physical properties, such as the large anomalous Hall effect (AHE) and the anomalous Nernst effect (ANE). And also Co3Sn2S2 is the first experimentally confirmed magnetic Weyl semimetal. In this talk, I will introduce how to use the angle-resolved photoemission spectroscopy (ARPES) to confirm the magnetic Weyl semimetal phase in Co3Sn2S2, including the observation of the surface Fermi arcs and bulk Weyl point [1], the observation of the spin-orbit coupling (SOC) effect [2], and the observation of the topological phase transition in Co3Sn2S2 [3]. These results not only can help to understand the formation mechanism of the Weyl semiemtal phase and the large anomalous Hall effect (AHE) and the anomalous Nernst effect (ANE) in Co3Sn2S2, but also provide insights into the interplay between the magnetism and the topology.
[1] D.F. Liu et al., Science 365, 1282-1285 (2019)
[2] D.F. Liu et al., arXiv: 2103.08113
[3] D.F. Liu et al., arXiv: 2106.03229