Signatures of Weyl Fermion Annihilation in a Correlated Kagome Magnet
Belopolski I, Cochran TA, Liu X, Cheng ZJ, Yang XP, Guguchia Z, Tsirkin SS, Yin JX, Vir P, Thakur GS, Zhang SS, Zhang J, Kaznatcheev K, Cheng G, Chang G, Multer D, Shumiya N, Litskevich M, Vescovo E, Kim TK, Cacho C, Yao N, Felser C, Neupert T, Hasan MZ (2021)
Publication Type: Journal article
Publication year: 2021
Journal
Book Volume: 127
Article Number: 256403
Journal Issue: 25
DOI: 10.1103/PhysRevLett.127.256403
Abstract
The manipulation of topological states in quantum matter is an essential pursuit of fundamental physics and next-generation quantum technology. Here we report the magnetic manipulation of Weyl fermions in the kagome spin-orbit semimetal Co3Sn2S2, observed by high-resolution photoemission spectroscopy. We demonstrate the exchange collapse of spin-orbit-gapped ferromagnetic Weyl loops into paramagnetic Dirac loops under suppression of the magnetic order. We further observe that topological Fermi arcs disappear in the paramagnetic phase, suggesting the annihilation of exchange-split Weyl points. Our findings indicate that magnetic exchange collapse naturally drives Weyl fermion annihilation, opening new opportunities for engineering topology under correlated order parameters.
Involved external institutions
Princeton University
United States (USA) (US)
University of Zurich / Universität Zürich (UZH)
Switzerland (CH)
Max-Planck-Institut für Chemische Physik fester Stoffe (MPI CPfS) / Max Planck Institute for Chemical Physics of Solids
Germany (DE)
Brookhaven National Laboratory
United States (USA) (US)
Nanyang Technological University (NTU)
Singapore (SG)
Diamond Light Source
United Kingdom (GB)
United States (USA) (US)
University of Zurich / Universität Zürich (UZH)
Switzerland (CH)
Max-Planck-Institut für Chemische Physik fester Stoffe (MPI CPfS) / Max Planck Institute for Chemical Physics of Solids
Germany (DE)
Brookhaven National Laboratory
United States (USA) (US)
Nanyang Technological University (NTU)
Singapore (SG)
Diamond Light Source
United Kingdom (GB)
How to cite
APA:
Belopolski, I., Cochran, T.A., Liu, X., Cheng, Z.-J., Yang, X.P., Guguchia, Z.,... Hasan, M.Z. (2021). Signatures of Weyl Fermion Annihilation in a Correlated Kagome Magnet. Physical Review Letters, 127(25). https://doi.org/10.1103/PhysRevLett.127.256403
MLA:
Belopolski, Ilya, et al. "Signatures of Weyl Fermion Annihilation in a Correlated Kagome Magnet." Physical Review Letters 127.25 (2021).
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