Citation: XU Ning, KONG Fan-Jie, WANG Yan-Zong. Electronic Transport in Z-Shaped Graphene-Nanoribbons: Shape and Size Effects[J]. Acta Physico-Chimica Sinica, ;2011, 27(03): 559-563. doi: 10.3866/PKU.WHXB20110305 shu

Electronic Transport in Z-Shaped Graphene-Nanoribbons: Shape and Size Effects

1.
1. Department of Physics, Yancheng Institute of Technology, Yancheng 224051, Jiangsu Province, P. R. China;
2. Department of Physics, Huaiyin Institute of Technology, Huaiyin 223003, Jiangsu Province, P. R. China

Received Date: 12 October 2010
Available Online: 21 January 2011
Fund Project: 国家自然科学基金(10874052) (10874052)全国优秀博士学位论文基金(200726)资助项目 (200726)

Based on the Green′s function method and the Landauer-Büttiker formula, we studied the electronic transport properties of a graphene heterojunction. This was a Z-shaped graphene nanoribbon (GNR), which was connected by zigzag graphene nanoribbon leads. We show that the conductance of the Z-shaped GNRs is highly sensitive to the shape and size of the heterojunctions. The charge density is strongly localized on the zigzag edge sites of the leads and thereby a conductance dip or gap results at the Fermi energy. By varying the width of the graphene ribbons between the junctions, we found many more resonant peaks in the conduction because of the quasi-bound states. The number of resonant peaks has little to do with the length of the graphene ribbons between the junctions. Importantly, we show that in the low-energy region the electrons retain their ballistic transport characteristic in the width uniformity of Z-shaped GNRs with included angle θ of 60° or 150° turns. These findings show that the Z-shaped GNRs can be selected for future ballistic device applications.
- Tight-binding model,
- Green′s function,
- Graphene-nanoribbon,
- Conductance
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