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


Book Volume: 127

Article Number: 256403

Journal Issue: 25

DOI: 10.1103/PhysRevLett.127.256403


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.

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How to cite


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).


Belopolski, Ilya, et al. "Signatures of Weyl Fermion Annihilation in a Correlated Kagome Magnet." Physical Review Letters 127.25 (2021).

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