Tunable Dirac points and high spin polarization in ferromagnetic-strain graphene superlattices

Spin-dependent energy bands and transport properties of ferromagnetic-strain graphene superlattices are studied. The high spin polarization appears at the Dirac points due to the presence of spin-dependent Dirac points in the energy band structure. A gap can be induced in the vicinity of Dirac point...

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Bibliographic Details
Published in:Scientific reports 2017-11, Vol.7 (1), p.14636-10, Article 14636
Main Authors: Wu, Qing-Ping, Liu, Zheng-Fang, Chen, Ai-Xi, Xiao, Xian-Bo, Miao, Guo-Xing
Format: Article
Language:English
Subjects:
639/301/119/1001
639/301/357/918/1052
639/766/1130/2798
Computer memory
Electrons
Humanities and Social Sciences
multidisciplinary
Nanocrystals
Polarization
Random access memory
Science
Science (multidisciplinary)
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Summary:Spin-dependent energy bands and transport properties of ferromagnetic-strain graphene superlattices are studied. The high spin polarization appears at the Dirac points due to the presence of spin-dependent Dirac points in the energy band structure. A gap can be induced in the vicinity of Dirac points by strain and the width of the gap is enlarged with increasing strain strength, which is beneficial for enhancing spin polarization. Moreover, a full spin polarization can be achieved at large strain strength. The position and number of the Dirac points corresponding to high spin polarization can be effectively manipulated with barrier width, well width and effective exchange field, which reveals a remarkable tunability on the wavevector filtering behavior.
ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-017-14948-y