Non-Invasive Nanoscale Potentiometry and Ballistic Transport in Epigraphene Nanoribbons

The recent observation of non-classical electron transport regimes in two-dimensional materials has called for new high-resolution non-invasive techniques to locally probe electronic properties. We introduce a novel hybrid scanning probe technique to map the local resistance and electrochemical pote...

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Bibliographic Details
Published in:Nano letters 2020-05, Vol.20 (5), p.3786-3790
Main Authors: De Cecco, Alessandro, Prudkovskiy, Vladimir S, Wander, David, Ganguly, Rini, Berger, Claire, de Heer, Walt A, Courtois, Hervé, Winkelmann, Clemens B
Format: Article
Language:English
Subjects:
Condensed Matter
Mesoscopic Systems and Quantum Hall Effect
Physics
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Summary:The recent observation of non-classical electron transport regimes in two-dimensional materials has called for new high-resolution non-invasive techniques to locally probe electronic properties. We introduce a novel hybrid scanning probe technique to map the local resistance and electrochemical potential with nm- and μV resolution, and we apply it to study epigraphene nanoribbons grown on the sidewalls of SiC substrate steps. Remarkably, the potential drop is non-uniform along the ribbons, and μm-long segments show no potential variation with distance. The potential maps are in excellent agreement with measurements of the local resistance. This reveals ballistic transport, compatible with μm-long room-temperature electronic mean-free paths.
ISSN:1530-6984
1530-6992
DOI:10.1021/acs.nanolett.0c00838