Interplay of Dirac electrons and magnetism in CaMnBi2 and SrMnBi2

Zhang, Anmin; Liu, Changle; Yi, Changjiang; Zhao, Guihua; Xia, Tian-long; Ji, Jianting; Shi, Youguo; Yu, Rong; Wang, Xiaoqun; Chen, Changfeng; Zhang, Qingming

doi:10.1038/ncomms13833

Title: Interplay of Dirac electrons and magnetism in CaMnBi² and SrMnBi₂

Journal Article · Fri Dec 16 00:00:00 EST 2016 · Nature Communications

DOI:https://doi.org/10.1038/ncomms13833· OSTI ID:1361515

Zhang, Anmin ^[1]; Liu, Changle ^[1]; Yi, Changjiang ^[2]; Zhao, Guihua ^[1]; Xia, Tian-long ^[1]; Ji, Jianting ^[1]; Shi, Youguo ^[2]; Yu, Rong ^[3]; Wang, Xiaoqun ^[4]; Chen, Changfeng ^[5]; Zhang, Qingming ^[3]

Renmin Univ. of China, Beijing (China). Dept. of Physics, Beijing Key Lab. of Opto-Electronic Functional Materials and Micro-nano Devices
Chinese Academy of Sciences (CAS), Beijing (China). Beijing National Lab. for Condensed Matter Physics, Inst. of Physics
Renmin Univ. of China, Beijing (China). Dept. of Physics, Beijing Key Lab. of Opto-Electronic Functional Materials and Micro-nano Devices; Collaborative Innovation Center of Advanced Microstructures, Nanjing (China)
Renmin Univ. of China, Beijing (China). Dept. of Physics, Beijing Key Lab. of Opto-Electronic Functional Materials and Micro-nano Devices; Collaborative Innovation Center of Advanced Microstructures, Nanjing (China); Shanghai Jiao Tong Univ. (China). Dept. of Physics and Astronomy
Univ. of Nevada, Las Vegas, NV (United States). Dept. of Physics and High Pressure Science and Engineering Center

Dirac materials exhibit intriguing low-energy carrier dynamics that offer a fertile ground for novel physics discovery. Something of particular interest is the interplay of Dirac carriers with other quantum phenomena such as magnetism. We report on a two-magnon Raman scattering study of AMnBi₂ (A=Ca, Sr), a prototypical magnetic Dirac system comprising alternating Dirac carrier and magnetic layers. We present the first accurate determination of the exchange energies in these compounds and, by comparison with the reference compound BaMn₂Bi₂, we show that the Dirac carrier layers in AMnBi₂ significantly enhance the exchange coupling between the magnetic layers, which in turn drives a charge-gap opening along the Dirac locus. These findings break new grounds in unveiling the fundamental physics of magnetic Dirac materials, which offer a novel platform for probing a distinct type of spin–Fermion interaction. Our results also hold great promise for applications in magnetic Dirac devices.

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Research Organization:: Univ. of Nevada, Las Vegas, NV (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: NA0001982

OSTI ID:: 1361515

Journal Information:: Nature Communications, Vol. 7; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 52 works

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Title: Interplay of Dirac electrons and magnetism in CaMnBi² and SrMnBi₂