期刊
NANO LETTERS
卷 12, 期 7, 页码 3424-3430出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl3004122
关键词
Graphene junctions; quantum transport; pseudodiffusive electron transport; Fano factor
类别
资金
- U.S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering [DEFG02-97ER45632]
- National Science Foundation [DMR-10-55799, DMR-08-20382]
- Georgia Tech MRSEC
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [820382] Funding Source: National Science Foundation
- EPSCoR
- Office Of The Director [0918970] Funding Source: National Science Foundation
Graphene is believed to be an excellent candidate material for next-generation electronic devices. However, one needs to take into account the nontrivial effect of metal contacts in order to precisely control the charge injection and extraction processes. We have performed transport calculations for graphene junctions with wetting metal leads (metal leads that bind covalently to graphene) using nonequilibrium Green's functions and density functional theory. Quantitative information is provided on the increased resistance with respect to ideal contacts and on the statistics of current fluctuations. We find that charge transport through the studied two-terminal graphene junction with Ti contacts is pseudo-diffusive up to surprisingly high energies.
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