Journal
NANOTECHNOLOGY
Volume 23, Issue 39, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0957-4484/23/39/395203
Keywords
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Funding
- Deutsche Forschungsgemeinschaft [Ku 565/13-1, Se 1087/5-1, Se1087/7-1]
- RUB Research School
- DFG in the framework of the Excellence initiative [DFG GSC 98/1]
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In this paper we investigate the influence of material and device properties on the ballistic transport in epitaxial monolayer graphene and epitaxial quasi-free-standing monolayer graphene. Our studies comprise (a) magneto-transport in two-dimensional (2D) Hall bars, (b) temperature- and magnetic-field-dependent bend resistance of unaligned and step-edge-aligned orthogonal cross junctions, and (c) the influence of the lead width of the cross junctions on ballistic transport. We found that ballistic transport is highly sensitive to scattering at the step edges of the silicon carbide substrate. A suppression of the ballistic transport is observed if the lead width of the cross junction is reduced from 50 nm to 30 nm. In a 50 nm wide device prepared on quasi-free-standing graphene we observe a gradual transition from the ballistic into the diffusive transport regime if the temperature is increased from 4.2 to about 50 K, although 2D Hall bars show a temperature-independent mobility. Thus, in 1D devices additional temperature-dependent scattering mechanisms play a pivotal role.
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