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Disorder-induced gap behavior in graphene nanoribbons
Open accessAbstract
We study the transport properties of graphene nanoribbons of standardized 30 nm width and varying lengths. We find that the extent of the gap observed in transport as a function of Fermi energy in these ribbons (the ``transport gap'') does not have a strong dependence on ribbon length, while the extent of the gap as a function of source-drain voltage (the ``source-drain gap'') increases with increasing ribbon length. We anneal the ribbons to reduce the amplitude of the disorder potential and find that the transport gap both shrinks and moves closer to zero gate voltage. In contrast, annealing does not systematically affect the source-drain gap. We conclude that the transport gap reflects the overall strength of the background disorder potential, while the source-drain gap is sensitively dependent on its details. Our results support the model that transport in graphene nanoribbons occurs through quantum dots forming along the ribbon due to a disorder potential induced by charged impurities.
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Cites
Narrow graphene nanoribbons from carbon nanotubes
Jiao, L., Zhang, L., Wang, X., Diankov, G., & Dai, H. (2009) · Nature · doi:10.1038/nature07919 · Cited by 2,441
Cited by
Colloquium: The transport properties of graphene: An introduction
Peres, N. M. R. (2010) · Reviews of Modern Physics · doi:10.1103/revmodphys.82.2673 · Cited by 1,017
Rozhkov, A. V., Giavaras, G., Bliokh, Y. P., Freilikher, V., & Nori, F. (2011) · Physics Reports · doi:10.1016/j.physrep.2011.02.002 · Cited by 340
Magical Allotropes of Carbon: Prospects and Applications
Tiwari, S. K., Kumar, V., Huczko, A., Oraon, R., Adhikari, A. D., & Nayak, G. C. (2016) · Critical Reviews in Solid State and Materials Sciences · doi:10.1080/10408436.2015.1127206 · Cited by 320
Very large magnetoresistance in graphene nanoribbons
Bai, J., Cheng, R., Xiu, F., Liao, L., Wang, M., Shailos, A., Wang, K. L., Huang, Y., & Duan, X. (2010) · Nature Nanotechnology · doi:10.1038/nnano.2010.154 · Cited by 262
Metadata
- Authors
- Gallagher, P., Todd, K., & Goldhaber-Gordon, D.
- Venue
- Physical Review B
- Publisher
- American Physical Society (APS)
- Published
- 2010-03-05
- Volume
- 81
- Issue
- 11
- ISSN
- 1098-0121 (ISSN-L)
- 1550-235X
- OpenAlex
- W2087697100
- Cited by
- 200
- References
- 1
- FWCI
- 15.29
- Type
- journal article
- Language
- en
- Open access
- green
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