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Chiral Dirac Fermion in a Collinear Antiferromagnet

Chinese Physics Letters 2023年第12期40卷 84-91页

作者：张奥邓可盛洁明刘鹏飞 Shiv Kumar Kenya Shimada 江志诚刘正太沈大伟李嘉裕任俊王乐周良 Yoshihisa Ishikawa takashi ohhara Qiang Zhang Garry McIntyre Dehong Yu 刘恩克吴留锁陈朝宇刘奇航 Shenzhen Institute for Quantum Science and Technology and Department of Physics Southern University of Science and TechnologyShenzhen 518055China Academy for Advanced Interdisciplinary Studies Southern University of Science and TechnologyShenzhen 518055China Hiroshima Synchrotron Radiation Centre Hiroshima UniversityHigashi-HiroshimaHiroshima 739-0046Japan State Key Laboratory of Functional Materials for Informatics and Center for Excellence in Superconducting Electronics Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China Neutron Science and Technology Center Comprehensive Research Organization for Science and SocietyTokaiIbaraki 319-1106Japan Neutron Science Section J-PARC CenterJapan Atomic Energy AgencyIbaraki 319-1195Japan Neutron Science Division Oak Ridge National LaboratoryOak RidgeTennessee 37831USA Australian Nuclear Science and Technology Organisation Locked bag 2001Kirrawee DCNew South Wales 2232Australia State Key Laboratory for Magnetism Institute of PhysicsChinese Academy of SciencesBeijing 100190China

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 CoNb3S6. Combining with neutron diffraction and first-principles calculations, we suggest a multidomain collinear antiferromagnetic configuration, rendering the the existence of the Fermi-arc surface states induced by chiral Dirac-like *** 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.

关键词： Fermi Dirac chiral

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