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Abnormal electronic transport in disordered graphene nanoribbon |
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| Authors: | Yan-Yang Zhang Jiang-Ping Hu W.M. Liu |
| Affiliation: | a Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China b Department of Physics, Purdue University, West Lafayette, Indiana 47907, USA c Department of Physics, Oklahoma State University, Stillwater, Oklahoma 74078, USA |
| Abstract: | We investigate the conductivity σ of graphene nanoribbons with zigzag edges as a function of Fermi energy EF in the presence of the impurities with different potential range. The dependence of σ(EF) displays four different types of behavior, classified to different regimes of length scales decided by the impurity potential range and its density. Particularly, low density of long range impurities results in an extremely low conductance compared to the ballistic value, a linear dependence of σ(EF) and a wide dip near the Dirac point, due to the special properties of long range potential and edge states. These behaviors agree well with the results from a recent experiment by Miao et al. [Science 317 (2007) 1530 (SOM)]. |
| Keywords: | 72.10.&minus d 72.15.Rn 73.20.At 73.20.Fz |
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