Signatures of Weyl Fermion Annihilation in a Correlated Kagome Magnet

Ilya Belopolski; Tyler A. Cochran; Xiaoxiong Liu; Zi Jia Cheng; Xian P. Yang; Zurab Guguchia; Stepan S. Tsirkin; Jia Xin Yin; Praveen Vir; Gohil S. Thakur; Songtian S. Zhang; Junyi Zhang; Konstantine Kaznatcheev; Guangming Cheng; Guoqing Chang; Daniel Multer; Nana Shumiya; Maksim Litskevich; Elio Vescovo; Timur K. Kim; Cephise Cacho; Nan Yao; Claudia Felser; Titus Neupert; M. Zahid Hasan

doi:10.1103/PhysRevLett.127.256403

Signatures of Weyl Fermion Annihilation in a Correlated Kagome Magnet

Ilya Belopolski, Tyler A. Cochran, Xiaoxiong Liu, Zi Jia Cheng, Xian P. Yang, Zurab Guguchia, Stepan S. Tsirkin, Jia Xin Yin, Praveen Vir, Gohil S. Thakur, Songtian S. Zhang, Junyi Zhang, Konstantine Kaznatcheev, Guangming Cheng, Guoqing Chang, Daniel Multer, Nana Shumiya, Maksim Litskevich, Elio Vescovo, Timur K. KimCephise Cacho, Nan Yao, Claudia Felser, Titus Neupert, M. Zahid Hasan

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24 Scopus citations

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.

Original language	English (US)
Article number	256403
Journal	Physical review letters
Volume	127
Issue number	25
DOIs	https://doi.org/10.1103/PhysRevLett.127.256403
State	Published - Dec 17 2021

All Science Journal Classification (ASJC) codes

General Physics and Astronomy

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10.1103/PhysRevLett.127.256403

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Belopolski, I., Cochran, T. A., Liu, X., Cheng, Z. J., Yang, X. P., Guguchia, Z., Tsirkin, S. S., Yin, J. X., Vir, P., Thakur, G. S., Zhang, S. S., Zhang, J., Kaznatcheev, K., Cheng, G., Chang, G., Multer, D., Shumiya, N., Litskevich, M., Vescovo, E., ... Hasan, M. Z. (2021). Signatures of Weyl Fermion Annihilation in a Correlated Kagome Magnet. Physical review letters, 127(25), Article 256403. https://doi.org/10.1103/PhysRevLett.127.256403

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title = "Signatures of Weyl Fermion Annihilation in a Correlated Kagome Magnet",

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.",

author = "Ilya Belopolski and Cochran, {Tyler A.} and Xiaoxiong Liu and Cheng, {Zi Jia} and Yang, {Xian P.} and Zurab Guguchia and Tsirkin, {Stepan S.} and Yin, {Jia Xin} and Praveen Vir and Thakur, {Gohil S.} and Zhang, {Songtian S.} and Junyi Zhang and Konstantine Kaznatcheev and Guangming Cheng and Guoqing Chang and Daniel Multer and Nana Shumiya and Maksim Litskevich and Elio Vescovo and Kim, {Timur K.} and Cephise Cacho and Nan Yao and Claudia Felser and Titus Neupert and Hasan, {M. Zahid}",

note = "Publisher Copyright: {\textcopyright} 2021 American Physical Society.",

year = "2021",

month = dec,

day = "17",

doi = "10.1103/PhysRevLett.127.256403",

language = "English (US)",

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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, 'Signatures of Weyl Fermion Annihilation in a Correlated Kagome Magnet', Physical review letters, vol. 127, no. 25, 256403. https://doi.org/10.1103/PhysRevLett.127.256403

TY - JOUR

T1 - Signatures of Weyl Fermion Annihilation in a Correlated Kagome Magnet

AU - Belopolski, Ilya

AU - Cochran, Tyler A.

AU - Liu, Xiaoxiong

AU - Cheng, Zi Jia

AU - Yang, Xian P.

AU - Guguchia, Zurab

AU - Tsirkin, Stepan S.

AU - Yin, Jia Xin

AU - Vir, Praveen

AU - Thakur, Gohil S.

AU - Zhang, Songtian S.

AU - Zhang, Junyi

AU - Kaznatcheev, Konstantine

AU - Cheng, Guangming

AU - Chang, Guoqing

AU - Multer, Daniel

AU - Shumiya, Nana

AU - Litskevich, Maksim

AU - Vescovo, Elio

AU - Kim, Timur K.

AU - Cacho, Cephise

AU - Yao, Nan

AU - Felser, Claudia

AU - Neupert, Titus

AU - Hasan, M. Zahid

PY - 2021/12/17

Y1 - 2021/12/17

N2 - 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.

AB - 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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JO - Physical review letters

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ER -

Signatures of Weyl Fermion Annihilation in a Correlated Kagome Magnet

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