Room temperature ballistic transport in long sidewall graphene nanoribbons
Mardi 27 février 2018 13:30
- Duree : 1 heure
Lieu : LNCMI, salle de conférences "René Pauthenet" (bâtiment J, 2ème étage) - 25 rue des martyrs - 38000 Grenoble
Orateur : Vladimir PRUDKOVSKIY (QUEST, Institut Néel, Grenoble & Georgia Institute of Technology, School of Physics, USA)
Exceptional ballistic transport was observed recently in epitaxial graphene nanoribbons (GNRs) at room temperature [1]. These objects are of particular fundamental interest as they provide a direct access to charge neutral graphene. Transport in graphene close to the Dirac point has been the subject of numerous theoretical studies. Several experimental attempts in were mainly facing a system’s inhomogeneity as the main obstacle. We have optimized growth parameters for harvesting sidewall GNRs with exceptional uniformity and purity over tens of microns long being just a few tens of nanometers large. In my talk I will present growth process and structural characterization of these GNRs, followed by transport properties. Both conventional transport : temperature ehavior, magnetoresistance and local techniques : STS, STM potentiometry have been employed. Two different transport regimes had been observed as a function of GNR length. Temperature and magnetoresistance behavior will be discussed.
[1] J. Baringhaus et al., Nature 506, 349 (2014).
Contact : anne-laure.barra@lncmi.cnrs.fr
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