期刊
PHYSICAL REVIEW B
卷 83, 期 15, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.83.155409
关键词
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资金
- US Army Research Laboratory
- US Army Research Office [W911NF-09-1-0333]
- NSF [DMR/0748910, CBET/0756359]
- ONR/DMEA [H94003-07-2-0703]
- FENA Focus Center
- [NSF EECS/0925152]
- Directorate For Engineering
- Div Of Electrical, Commun & Cyber Sys [0925152] Funding Source: National Science Foundation
Using scanning tunneling microscopy (STM), we have imaged local charge density fluctuations in monolayer graphene. By placing a small gold nanoparticle on the end of the STM tip, a charge sensor is created. By raster scanning the tip over the surface and using Coulomb blockade spectroscopy, we map the local potential on the graphene. We observe a series of electron and hole doped puddles with a characteristic length scale of similar to 20 nm. Theoretical calculations for the correlation length of the puddles based on the number of impurities are in agreement with our measurements.
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