Peculiar Magnetotransport Features of Ultranarrow Graphene Nanoribbons under High Magnetic Field

This is the authors' abstract. We don't add key points for this paper.

Through magnetotransport measurements, we investigate ultrasmooth graphene bilayer nanoribbons obtained by multiwall carbon nanotube unzipping, under a high magnetic field up to 55 T. The high quality of the samples allows us to observe a Hall quantization in ribbons as narrow as 20 nm. The presence, for certain samples, of isolated peaks in the resistance plateau is found to be related to a very moderate long-range disorder, which induces magnetic-field-dependent interedge scattering. Tight-binding numerical simulations of electron transport illustrate and confirm this picture. Our study provides important insights into the quantum Hall effect in quasi-1D systems and indicates possible lines for future investigations of the nonchiral edge states induced by zigzag nanoribbon sections.