Z形石墨带的电子输运性质: 形状与尺寸效应

引用本文: 徐宁, 孔凡杰, 王延宗. Z形石墨带的电子输运性质: 形状与尺寸效应[J]. 物理化学学报, 2011, 27(03): 559-563. doi: 10.3866/PKU.WHXB20110305 shu

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

Z形石墨带的电子输运性质: 形状与尺寸效应

基金项目:
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)

摘要:

基于格林函数方法及Landauer-Büttiker公式, 研究了纳米石墨带异质结的电子输运性质, 石墨带异质结由Z 形石墨带与两个锯齿型石墨带电极构成. 研究发现电导大小依赖其几何构型. 由于电子局域在锯齿型石墨带边缘, 因此在费米能级附近出现了电导隙或电导谷. 调节结间石墨带的宽度, 发现准束缚态的存在诱导许多尖锐的电导峰, 电导峰的数目几乎与结间的石墨带长度无关. 在低能区, 当θ为60°或150°时, 宽度均匀的Z型石墨带仍然保持弹道输运特征. 因此, Z形纳米石墨带可选择地应用于未来的纳微电路.

关键词:

English

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: 03 March 2011
Fund Project:
国家自然科学基金(10874052)

全国优秀博士学位论文基金(200726)资助项目

Abstract:

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.

Key words:

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沈阳化工大学材料科学与工程学院沈阳 110142

Z形石墨带的电子输运性质: 形状与尺寸效应

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通讯作者: 陈斌, bchen63@163.com

中国化学会秘书处

Z形石墨带的电子输运性质: 形状与尺寸效应

English

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

CCS Chemistry：嵌段共聚物自组装成 “三明治”二维有机材料，实现纳米级压力传感功能

CCS Chemistry：颜徐州、鲍哲南： 你的皮肤可能是一片SPMs

CCS Chemistry：工作高效不疲劳，只须让催化剂动起来

CCS Chemistry：静电组装导向聚合- 聚电解质纳米凝胶量化制备新策略

CCS Chemistry：金黄色葡萄球菌醛基脱氢酶是如何识别特异性底物的？

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