Interplay of Dirac electrons and magnetism in CaMnBi2 and SrMnBi2
- 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.
- 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
Web of Science
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