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Title: Interplay of Dirac electrons and magnetism in CaMnBi 2 and SrMnBi 2

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 AMnBi 2 (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 BaMn 2Bi 2, we show that the Dirac carrier layers in AMnBi 2 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.
Authors:
 [1] ;  [1] ;  [2] ;  [1] ;  [1] ;  [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [3]
  1. Renmin Univ. of China, Beijing (China). Dept. of Physics, Beijing Key Lab. of Opto-Electronic Functional Materials and Micro-nano Devices
  2. Chinese Academy of Sciences (CAS), Beijing (China). Beijing National Lab. for Condensed Matter Physics, Inst. of Physics
  3. 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)
  4. 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
  5. Univ. of Nevada, Las Vegas, NV (United States). Dept. of Physics and High Pressure Science and Engineering Center
Publication Date:
Grant/Contract Number:
NA0001982
Type:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 7; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Research Org:
Univ. of Nevada, Las Vegas, NV (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; electronic properties and materials; magnetic properties and materials
OSTI Identifier:
1361515

Zhang, Anmin, Liu, Changle, Yi, Changjiang, Zhao, Guihua, Xia, Tian-long, Ji, Jianting, Shi, Youguo, Yu, Rong, Wang, Xiaoqun, Chen, Changfeng, and Zhang, Qingming. Interplay of Dirac electrons and magnetism in CaMnBi2 and SrMnBi2. United States: N. p., Web. doi:10.1038/ncomms13833.
Zhang, Anmin, Liu, Changle, Yi, Changjiang, Zhao, Guihua, Xia, Tian-long, Ji, Jianting, Shi, Youguo, Yu, Rong, Wang, Xiaoqun, Chen, Changfeng, & Zhang, Qingming. Interplay of Dirac electrons and magnetism in CaMnBi2 and SrMnBi2. United States. doi:10.1038/ncomms13833.
Zhang, Anmin, Liu, Changle, Yi, Changjiang, Zhao, Guihua, Xia, Tian-long, Ji, Jianting, Shi, Youguo, Yu, Rong, Wang, Xiaoqun, Chen, Changfeng, and Zhang, Qingming. 2016. "Interplay of Dirac electrons and magnetism in CaMnBi2 and SrMnBi2". United States. doi:10.1038/ncomms13833. https://www.osti.gov/servlets/purl/1361515.
@article{osti_1361515,
title = {Interplay of Dirac electrons and magnetism in CaMnBi2 and SrMnBi2},
author = {Zhang, Anmin and Liu, Changle and Yi, Changjiang and Zhao, Guihua and Xia, Tian-long and Ji, Jianting and Shi, Youguo and Yu, Rong and Wang, Xiaoqun and Chen, Changfeng and Zhang, Qingming},
abstractNote = {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.},
doi = {10.1038/ncomms13833},
journal = {Nature Communications},
number = ,
volume = 7,
place = {United States},
year = {2016},
month = {12}
}