Edge magnetotransport fingerprints in disordered graphene nanoribbons

Edge magnetotransport fingerprints in disordered graphene nanoribbons

Jean-Marie Poumirol,1 Alessandro Cresti,2,* Stephan Roche,3,4 Walter Escoffier,1 Michel Goiran,1 Xinran Wang,5 Xiaolin Li,5 Hongjie Dai,5 and Bertrand Raquet1 1Laboratoire National des Champs Magnétiques Intenses, INSA UPS CNRS, UPR 3228, Université de Toulouse, 143 avenue de Rangueil, 31400 Toulouse, France 2LETI, MINATEC, CEA, F38054 Grenoble, France 3INAC, SP2M, Lsim, CEA, 17 avenue des Mart...

Suppression of magnetotransport in strongly disordered graphene.

A tight-binding model with randomly fluctuating atomic positions is studied to discuss the effect of strong disorder in graphene. We employ a strong-disorder expansion for the transport quantities and find a diffusive behavior, where the conductivity is decreasing with increasing disorder. For sufficiently strong disorder the magnetic field drops out of the diffusion coefficient and the conduct...

Raman Fingerprints of Atomically Precise Graphene Nanoribbons

Bottom-up approaches allow the production of ultranarrow and atomically precise graphene nanoribbons (GNRs) with electronic and optical properties controlled by the specific atomic structure. Combining Raman spectroscopy and ab initio simulations, we show that GNR width, edge geometry, and functional groups all influence their Raman spectra. The low-energy spectral region below 1000 cm(-1) is p...

Electron transport in disordered graphene nanoribbons.

We report an electron transport study of lithographically fabricated graphene nanoribbons (GNRs) of various widths and lengths. At the charge neutrality point, a length-independent transport gap forms whose size is inversely proportional to the GNR width. In this gap, electrons are localized, and charge transport exhibits a transition between thermally activated behavior at higher temperatures ...

Graphene nanoribbons and edge reconstructions