Chiral Dirac Fermion in a Collinear Antiferromagnet

Zhang 张, Ao 奥.; Deng 邓, Ke 可.; Sheng 盛, Jieming 洁明; Liu 刘, Pengfei 鹏飞; Kumar, Shiv; Shimada, Kenya; Jiang 江, Zhicheng 志诚; Liu 刘, Zhengtai 正太; Shen 沈, Dawei 大伟; Li 李, Jiayu 嘉裕; Ren 任, Jun 俊.; Wang 王, Le 乐.; Zhou 周, Liang 良.; Ishikawa, Yoshihisa; Ohhara, Takashi; Zhang, Qiang; McIntyre, Garry; Yu, Dehong; Liu 刘, Enke 恩克; Wu 吴, Liusuo 留锁; Chen 陈, Chaoyu 朝宇; Liu 刘, Qihang 奇航

doi:10.1088/0256-307x/40/12/126101

Chiral Dirac Fermion in a Collinear Antiferromagnet

Journal Article · Fri Dec 01 00:00:00 EST 2023 · Chinese Physics Letters

DOI:https://doi.org/10.1088/0256-307x/40/12/126101· OSTI ID:2447241

Zhang 张, Ao 奥. ^[1]; Deng 邓, Ke 可. ^[1]; Sheng 盛, Jieming 洁明 ^[1]; Liu 刘, Pengfei 鹏飞 ^[1]; Kumar, Shiv ^[2]; Shimada, Kenya ^[2]; Jiang 江, Zhicheng 志诚 ^[3]; Liu 刘, Zhengtai 正太 ^[3]; Shen 沈, Dawei 大伟 ^[3]; Li 李, Jiayu 嘉裕 ^[1]; Ren 任, Jun 俊. ^[1]; Wang 王, Le 乐. ^[1]; Zhou 周, Liang 良. ^[1]; Ishikawa, Yoshihisa ^[4]; Ohhara, Takashi ^[5]; ^[6]; McIntyre, Garry ^[7]; Yu, Dehong ^[7]; Liu 刘, Enke 恩克 ^[8]; Wu 吴, Liusuo 留锁 ^[1] more »

Southern University of Science and Technology (SUSTech), Shenzhen (China)
Hiroshima Univ. (Japan)
Chinese Academy of Sciences (CAS), Shanghai (China)
Comprehensive Research Organization for Science and Society (Japan)
Japan Atomic Energy Agency (JAEA), Ibaraki (Japan)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Australian Nuclear Science and Technology Organisation (ANSTO), NSW (Australia)
Chinese Academy of Sciences (CAS), Beijing (China)

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 fermions. Finally, our work provides spectral evidence of the chiral Dirac-like fermion caused by particular spin symmetry in CoNb₃S₆, paving an avenue for exploring new emergent phenomena in antiferromagnets with unconventional quasiparticle excitations.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 2447241

Journal Information:: Chinese Physics Letters, Journal Name: Chinese Physics Letters Journal Issue: 12 Vol. 40; ISSN 0256-307X

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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