期刊
APPLIED PHYSICS LETTERS
卷 98, 期 24, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3595360
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资金
- ASEE
- Office of Naval Research
- University of Maryland NSF-MRSEC and MRSEC shared facilities [DMR 05-20741]
Ambient-environment Kelvin probe microscopy of many (10 mu m)(2) areas of single-layer graphene on SiC(0001) shows area-to-area rms surface potential variation of 12 meV. Electronic transport data are consistent with the minimum conductivity regime. Together the data indicate a highly uniform carrier concentration with a small magnitude (<10(12) cm(-2)). We conclude that the previously reported large spread in carrier densities from Hall measurements on similar samples is an artifact of electron-hole puddling in the minimum conductivity regime. (C) 2011 American Institute of Physics. [doi:10.1063/1.3595360]
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