Spin-polarized transport in graphene nanoribbon superlattices

doi:10.1088/1674-1056/21/10/107202

中国物理B ›› 2012, Vol. 21 ›› Issue (10): 107202-107202.doi: 10.1088/1674-1056/21/10/107202

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇下一篇

Spin-polarized transport in graphene nanoribbon superlattices

余欣欣, 谢月娥, 欧阳滔, 陈元平

Institute of Physics and Laboratory for Quantum Engineering and Micro-Nano Energy Technology, Xiangtan University, Xiangtan 411105, China

收稿日期:2012-03-08 修回日期:2012-05-04 出版日期:2012-09-01 发布日期:2012-09-01
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 51006086, 11074213, and 51176161), the Open Fund Based on Innovation Platform of Hunan Colleges and Universities, China (Grant No. 09K034), and the Joint Funds of Hunan Provincial Natural Science Foundation, China (Grant No. 10JJ9001).

Spin-polarized transport in graphene nanoribbon superlattices

Yu Xin-Xin (余欣欣), Xie Yue-E (谢月娥), Yang Tao (欧阳滔), Chen Yuan-Ping (陈元平)

Institute of Physics and Laboratory for Quantum Engineering and Micro-Nano Energy Technology, Xiangtan University, Xiangtan 411105, China

Received:2012-03-08 Revised:2012-05-04 Online:2012-09-01 Published:2012-09-01
Contact: Chen Yuan-Ping E-mail:chenyp@xtu.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 51006086, 11074213, and 51176161), the Open Fund Based on Innovation Platform of Hunan Colleges and Universities, China (Grant No. 09K034), and the Joint Funds of Hunan Provincial Natural Science Foundation, China (Grant No. 10JJ9001).

摘要/Abstract

摘要： 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.

关键词: spintronics, superlattices, zigzag graphene nanoribbons

Abstract: 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.

Key words: spintronics, superlattices, zigzag graphene nanoribbons

中图分类号: (Electronic transport in graphene)

72.80.Vp

72.25.-b (Spin polarized transport) 85.75.-d (Magnetoelectronics; spintronics: devices exploiting spin polarized transport or integrated magnetic fields)

余欣欣, 谢月娥, 欧阳滔, 陈元平. Spin-polarized transport in graphene nanoribbon superlattices[J]. 中国物理B, 2012, 21(10): 107202-107202.

Yu Xin-Xin (余欣欣), Xie Yue-E (谢月娥), Yang Tao (欧阳滔), Chen Yuan-Ping (陈元平). Spin-polarized transport in graphene nanoribbon superlattices[J]. Chin. Phys. B, 2012, 21(10): 107202-107202.

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Spin-polarized transport in graphene nanoribbon superlattices

Spin-polarized transport in graphene nanoribbon superlattices

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