Enhanced Conductance Fluctuation by Quantum Confinement Effect in Graphene Nanoribbons
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- 作者：Guangyu Xu ; Carlos M. Torres ; Jr. ; Emil B. Song ; Jianshi Tang ; Jingwei Bai ; Xiangfeng Duan ; Yuegang Zhang ; Kang L. Wang
- 刊名：Nano Letters
- 出版年：2010
- 出版时间：November 10, 2010
- 年：2010
- 卷：10
- 期：11
- 页码：4590-4594
- 全文大小：374K
- 年卷期：v.10,no.11(November 10, 2010)
- ISSN：1530-6992
文摘
Conductance fluctuation is usually unavoidable in graphene nanoribbons (GNR) due to the presence of disorder along its edges. By measuring the low-frequency noise in GNR devices, we find that the conductance fluctuation is strongly correlated with the density-of-states of GNR. In single-layer GNR, the gate-dependence of noise shows peaks whose positions quantitatively match the subband positions in the band structures of GNR. This correlation provides a robust mechanism to electrically probe the band structure of GNR, especially when the subband structures are smeared out in conductance measurement.