Valley selection rule in a Y-shaped zigzag graphene nanoribbon junction

doi:10.1088/1674-1056/23/8/087202

›› 2014, Vol. 23 ›› Issue (8): 87202-087202.doi: 10.1088/1674-1056/23/8/087202

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

Valley selection rule in a Y-shaped zigzag graphene nanoribbon junction

张林^a, 汪军^b

a Department of Applied Physics, College of Science, Nanjing Forestry University, Nanjing 210037, China;
b Department of Physics, Southeast University, Nanjing 210096, China

收稿日期:2013-11-15 修回日期:2014-02-14 出版日期:2014-08-15 发布日期:2014-08-15
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 110704033), the Natural Science Foundation of Jiangsu Province, China (Grant No. BK2010416), and the Natural Science Foundation for Colleges and Universities in Jiangsu Province, China (Grant No. 13KJB140005).

Valley selection rule in a Y-shaped zigzag graphene nanoribbon junction

Zhang Lin (张林)^a, Wang Jun (汪军)^b

a Department of Applied Physics, College of Science, Nanjing Forestry University, Nanjing 210037, China;
b Department of Physics, Southeast University, Nanjing 210096, China

Received:2013-11-15 Revised:2014-02-14 Online:2014-08-15 Published:2014-08-15
Contact: Zhang Lin E-mail:lzhang2011@gmail.com
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 110704033), the Natural Science Foundation of Jiangsu Province, China (Grant No. BK2010416), and the Natural Science Foundation for Colleges and Universities in Jiangsu Province, China (Grant No. 13KJB140005).

摘要/Abstract

摘要： The valley valve effect was predicted in a straight zigzag graphene nanoribbon (ZGR) p/n junction. In this work, we address a possible valley selection rule in a Y-shaped ZGR junction. By modeling the system as a three-terminal device and calculating the conductance spectrum, we found that the valley valve effect could be preserved in the system and the Y-shaped connection does not mix the valley index or the pseudoparities of quasiparticles. It is also shown that the Y-shaped ZGR device can be used to separate spins in real space according to the unchanged valley valve effect. Our finding might pave a way to manipulate and detect spins in a multi-terminal graphene-based spin device.

关键词: valley selection rule, zigzag graphene nanoribbon, pseudoparity, conductance

Abstract: The valley valve effect was predicted in a straight zigzag graphene nanoribbon (ZGR) p/n junction. In this work, we address a possible valley selection rule in a Y-shaped ZGR junction. By modeling the system as a three-terminal device and calculating the conductance spectrum, we found that the valley valve effect could be preserved in the system and the Y-shaped connection does not mix the valley index or the pseudoparities of quasiparticles. It is also shown that the Y-shaped ZGR device can be used to separate spins in real space according to the unchanged valley valve effect. Our finding might pave a way to manipulate and detect spins in a multi-terminal graphene-based spin device.

Key words: valley selection rule, zigzag graphene nanoribbon, pseudoparity, conductance

中图分类号: (Spin polarized transport in semiconductors)

72.25.Dc

72.80.Vp (Electronic transport in graphene) 72.25.Mk (Spin transport through interfaces)

张林, 汪军. Valley selection rule in a Y-shaped zigzag graphene nanoribbon junction[J]. , 2014, 23(8): 87202-087202.

Zhang Lin (张林), Wang Jun (汪军). Valley selection rule in a Y-shaped zigzag graphene nanoribbon junction[J]. Chin. Phys. B, 2014, 23(8): 87202-087202.

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Valley selection rule in a Y-shaped zigzag graphene nanoribbon junction

Valley selection rule in a Y-shaped zigzag graphene nanoribbon junction

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