Document Detail

Influence of structural properties on ballistic transport in nanoscale epitaxial graphene cross junctions.
MedLine Citation:
PMID:  22971877     Owner:  NLM     Status:  Publisher    
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.
Claudia Bock; Sonja Weingart; Epaminondas Karaissaridis; Ulrich Kunze; Florian Speck; Thomas Seyller
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-9-12
Journal Detail:
Title:  Nanotechnology     Volume:  23     ISSN:  1361-6528     ISO Abbreviation:  Nanotechnology     Publication Date:  2012 Sep 
Date Detail:
Created Date:  2012-9-13     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101241272     Medline TA:  Nanotechnology     Country:  -    
Other Details:
Languages:  ENG     Pagination:  395203     Citation Subset:  -    
Werkstoffe und Nanoelektronik, Ruhr-Universität Bochum, D-44780 Bochum, Germany.
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