Journal
PHYSICAL REVIEW LETTERS
Volume 104, Issue 5, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.104.056801
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Funding
- ONR MURI
- FENA
- NRI
- INDEX
- DARPA CERA
- DOE [DE-FG02-05ER46215]
- CNPq, Brazil
- U.S. Department of Energy (DOE) [DE-FG02-05ER46215] Funding Source: U.S. Department of Energy (DOE)
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We report an electron transport study of lithographically fabricated graphene nanoribbons (GNRs) of various widths and lengths. At the charge neutrality point, a length-independent transport gap forms whose size is inversely proportional to the GNR width. In this gap, electrons are localized, and charge transport exhibits a transition between thermally activated behavior at higher temperatures and variable range hopping at lower temperatures. By varying the geometric capacitance, we find that charging effects constitute a significant portion of the activation energy.
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