Spin-polarized transport in graphene nanoribbon superlattices
By the Green＇s function method,we investigate spin transport properties of a zigzag graphene nanoribbon superlattice（ZGNS） under a ferromagnetic insulator and edge effect.The exchange splitting induced by the ferromagnetic insulator eliminates the spin degeneracy,which leads to spin-polarized transp...
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| Veröffentlicht in: | Chinese physics B 2012-10, Vol.21 (10), p.410-414 |
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| creator | 余欣欣 谢月娥 欧阳滔 陈元平 |
| description | By the Green＇s function method,we investigate spin transport properties of a zigzag graphene nanoribbon superlattice（ZGNS） under a ferromagnetic insulator and edge effect.The exchange splitting induced by the ferromagnetic insulator eliminates the spin degeneracy,which leads to spin-polarized transport in structure.Spin-dependent minibands and minigaps are exhibited in the conductance profile near the Fermi energy.The location and width of the miniband are associated with the geometry of the ZGNS.In the optimal structure,the spin-up and spin-down minibands can be separated completely near the Fermi energy.Therefore,a wide,perfect spin polarization with clear stepwise pattern is observed,i.e.,the perfect spin-polarized transport can be tuned from spin up to spin down by varying the electron energy. |
| doi_str_mv | 10.1088/1674-1056/21/10/107202 |
| format | Article |
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| fulltext | fulltext |
| identifier | ISSN: 1674-1056 |
| ispartof | Chinese physics B, 2012-10, Vol.21 (10), p.410-414 |
| issn | 1674-1056 2058-3834 1741-4199 |
| language | eng |
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| source | IOP Publishing Journals |
| subjects | Fermi surfaces Ferromagnetism Graphene Insulators Nanostructure Optimization Superlattices Transport 格林函数方法 电子自旋极化 石墨 纳米带 自旋极化输运 费米能级 超晶格 边缘效应 |
| title | Spin-polarized transport in graphene nanoribbon superlattices |
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