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Direct observation of the spin-orbit coupling effect in magnetic Weyl semimetal Co3Sn2S2

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Xu,  Q. N.
Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Sun,  Y.
Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Felser,  C.
Claudia Felser, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Liu, D. F., Liu, E. K., Xu, Q. N., Shen, J. L., Li, Y. W., Pei, D., et al. (2022). Direct observation of the spin-orbit coupling effect in magnetic Weyl semimetal Co3Sn2S2. npj Quantum Materials, 7(1): 11, pp. 1-5. doi:10.1038/s41535-021-00392-9.


Cite as: http://hdl.handle.net/21.11116/0000-0009-F26F-A
Abstract
The spin-orbit coupling (SOC) lifts the band degeneracy that plays a vital role in the search for different topological states, such as topological insulators (TIs) and topological semimetals (TSMs). In TSMs, the SOC can partially gap a degenerate nodal line, leading to the formation of Dirac/Weyl semimetals (DSMs/WSMs). However, such SOC-induced gap structure along the nodal line in TSMs has not yet been systematically investigated experimentally. Here, we report a direct observation of such gap structure in a magnetic WSM Co3Sn2S2 using high-resolution angle-resolved photoemission spectroscopy. Our results not only reveal the existence and importance of the strong SOC effect in the formation of the WSM phase in Co3Sn2S2, but also provide insights for the understanding of its exotic physical properties.