Ballistic tracks in graphene nanoribbons

Johannes Aprojanz, Stephen R. Power, Pantelis Bampoulis, Stephan Roche, Antti-Pekka Jauho, Harold J. W. Zandvliet, Alexei A. Zakharov and Christoph Tegenkamp ()
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Johannes Aprojanz: Technische Universität Chemnitz
Stephen R. Power: CSIC and The Barcelona Institute of Science and Technology, Campus UAB, Bellaterra
Pantelis Bampoulis: University of Twente
Stephan Roche: CSIC and The Barcelona Institute of Science and Technology, Campus UAB, Bellaterra
Antti-Pekka Jauho: Technical University of Denmark
Harold J. W. Zandvliet: University of Twente
Alexei A. Zakharov: MAX IV Laboratory and Lund University
Christoph Tegenkamp: Technische Universität Chemnitz

Nature Communications, 2018, vol. 9, issue 1, 1-6

Abstract: Abstract High quality graphene nanoribbons epitaxially grown on the sidewalls of silicon carbide (SiC) mesa structures stand as key building blocks for graphene-based nanoelectronics. Such ribbons display 1D single-channel ballistic transport at room temperature with exceptionally long mean free paths. Here, using spatially-resolved two-point probe (2PP) measurements, we selectively access and directly image a range of individual transport modes in sidewall ribbons. The signature of the independently contacted channels is a sequence of quantised conductance plateaus for different probe positions. These result from an interplay between edge magnetism and asymmetric terminations at opposite ribbon edges due to the underlying SiC structure morphology. Our findings demonstrate a precise control of transport through multiple, independent, ballistic tracks in graphene-based devices, opening intriguing pathways for quantum information device concepts.

Date: 2018
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DOI: 10.1038/s41467-018-06940-5

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