Signatures of Weyl fermion annihilation in a correlated kagome magnet

Signatures of Weyl fermion annihilation in a correlated kagome magnet

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 spectrosc...

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Bibliographic Details
Main Authors: Belopolski, Ilya, Cochran, Tyler A., Liu, Xiaoxiong, Cheng, Zi-Jia, Yang, Xian P., Guguchia, Zurab, Tsirkin, Stepan S., Yin, Jia-Xin, Vir, Praveen, Thakur, Gohil S., Zhang, Songtian S., Zhang, Junyi, Kaznatcheev, Konstantine, Cheng, Guangming, Chang, Guoqing, Multer, Daniel, Shumiya, Nana, Litskevich, Maksim, Vescovo, Elio, Kim, Timur K., Cacho, Cephise, Yao, Nan, Felser, Claudia, Neupert, Titus, Hasan, M. Zahid
Other Authors: School of Physical and Mathematical Sciences
Format: Journal Article
Language:English
Published: 2022
Subjects:
Science::Physics
Weyl Semimetals
Topological Materials
Online Access:https://hdl.handle.net/10356/155549
Description
Summary: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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