| CONDENSED MATTER: STRUCTURE, MECHANICAL AND THERMAL PROPERTIES |
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Chiral Dirac Fermion in a Collinear Antiferromagnet |
| Ao Zhang1†, Ke Deng1†, Jieming Sheng1,2†, Pengfei Liu1†, Shiv Kumar3, Kenya Shimada3, Zhicheng Jiang4, Zhengtai Liu4, Dawei Shen4, Jiayu Li1, Jun Ren1, Le Wang1, Liang Zhou1, Yoshihisa Ishikawa5, Takashi Ohhara6, Qiang Zhang7, Garry McIntyre8, Dehong Yu8, Enke Liu9, Liusuo Wu1*, Chaoyu Chen1*, and Qihang Liu1* |
1Shenzhen Institute for Quantum Science and Technology and Department of Physics, Southern University of Science and Technology, Shenzhen 518055, China
2Academy for Advanced Interdisciplinary Studies, Southern University of Science and Technology, Shenzhen 518055, China
3Hiroshima Synchrotron Radiation Centre, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-0046, Japan
4State Key Laboratory of Functional Materials for Informatics and Center for Excellence in Superconducting Electronics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China
5Neutron Science and Technology Center, Comprehensive Research Organization for Science and Society, Tokai, Ibaraki 319-1106, Japan
6Neutron Science Section, J-PARC Center, Japan Atomic Energy Agency, Ibaraki 319-1195, Japan
7Neutron Science Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
8Australian Nuclear Science and Technology Organisation, Locked bag 2001, Kirrawee DC, New South Wales 2232, Australia
9State Key Laboratory for Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
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| Cite this article: |
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Ao Zhang, Ke Deng, Jieming Sheng et al 2023 Chin. Phys. Lett. 40 126101 |
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Abstract In a Dirac semimetal, the massless Dirac fermion has zero chirality, leading to surface states connected adiabatically to a topologically trivial surface state as well as vanishing anomalous Hall effect. Recently, it is predicted that in the nonrelativistic limit of certain collinear antiferromagnets, there exists a type of chiral “Dirac-like” fermion, whose dispersion manifests four-fold degenerate crossing points formed by spin-degenerate linear bands, with topologically protected Fermi arcs. Such an unconventional chiral fermion, protected by a hidden $SU(2)$ symmetry in the hierarchy of an enhanced crystallographic group, namely spin space group, is not experimentally verified yet. Here, by angle-resolved photoemission spectroscopy measurements, we reveal the surface origin of the electron pocket at the Fermi surface in collinear antiferromagnet CoNb$_{3}$S$_{6}$. Combining with neutron diffraction and first-principles calculations, we suggest a multidomain collinear antiferromagnetic configuration, rendering the existence of the Fermi-arc surface states induced by chiral Dirac-like fermions. Our work provides spectral evidence of the chiral Dirac-like fermion caused by particular spin symmetry in CoNb$_{3}$S$_{6}$, paving an avenue for exploring new emergent phenomena in antiferromagnets with unconventional quasiparticle excitations.
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Received: 30 November 2023
Express Letter
Published: 08 December 2023
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| PACS: |
61.50.Ah
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(Theory of crystal structure, crystal symmetry; calculations and modeling)
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75.50.Ee
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(Antiferromagnetics)
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