Chiral electronic excitations and strong electron-phonon coupling to Weyl fermions in the kagome semimetal Co 3 Sn 2 S 2
Year: 2025
Type: article
Abstract: Near a Weyl point, spin-momentum locking forces opposite spin orientations above and below the node. When a Weyl point lies near the Fermi surface, electrons can scatter across it only by flipping spin, thereby breaking time-reversal symmetry. This process appears exclusively in the antisymmetric $A$${}_{2g}$ Raman channel. The authors observe here enhanced $A$${}_{2g}$ intensity below the ferromagnetic transition of Co${}_{3}$Sn${}_{2}$S${}_{2}$, providing strong evidence for Weyl points. Furthermore, the calculated resonant $A$${}_{2g}$ response shows qualitative agreement with experiment.
DOI: 10.1103/wkzr-vfgn
Institutions: Bavarian Academy of Sciences and Humanities, Beijing Institute of Technology, University College Cork, Walther Meissner Institute, SLAC National Accelerator Laboratory, Stanford University, Chinese Academy of Sciences, Institute of Physics, University of Chinese Academy of Sciences, Leibniz Institute for Solid State and Materials Research, Technical University of Munich, University of California, Los Angeles, Songshan Lake Materials Laboratory
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Funders: U.S. Department of Energy, Alexander von Humboldt-Stiftung, Stanford University, National Energy Research Scientific Computing Center, Deutsche Forschungsgemeinschaft, National Natural Science Foundation of China, Chinese Academy of Sciences, Bayerisch-Kalifornischen Hochschulzentrum, Office of Science, National Key Research and Development Program of China, Basic Energy Sciences, SLAC National Accelerator Laboratory, Division of Materials Sciences and Engineering
Awards: G1229526393, G1286251239, G2153289549, G2371548206, G237429762, G262532246, G303061748, G3702897590, G4235786860, G4604337529, G4711507462, G495301720, G498139845, G5010377850, G5152083588, G545700390, G5570207115, G580818053, G6550344761, G6823224962, G7283024673, G7321538724, G7697322086, G8382000481, TRR 80: Von elektronischen Korrelationen zur Funktionalität, G8880951280, G911061179, G969889393
OpenAlex ID: W4416892283