Minke, Silvia and Jhang , Sung Ho and Wurm, Jürgen and Skourski, Yurii and Wosnitza, Joachim and Strunk, Christoph and Weiss, Dieter and Richter, Klaus and Eroms, Jonathan (2012) Magnetotransport through graphene nanoribbons at high magnetic fields. Physical Review B (PRB) 85, p. 195432.
We have investigated the magnetoresistance of lithographically prepared single-layer graphene nanoribbons in pulsed, perpendicular magnetic fields up to 60 T and performed corresponding transport simulations using a tight-binding model and several types of disorder. In experiment, at high carrier densities we observe Shubnikov-de Haas oscillations and the quantum Hall effect, while at low densities the oscillations disappear and an initially negative magnetoresistance becomes strongly positive at high magnetic fields. The strong resistance increase at very high fields and low-carrier densities is tentatively ascribed to a field-induced insulating state in the bulk graphene leads. Comparing numerical results and experiment, we demonstrate that at least edge disorder and bulk short-range impurities are important in our samples.
|Date:||15 May 2012|
|Institutions:|| Physics > Institute of Theroretical Physics > Chair Professor Richter > Group Klaus Richter|
Physics > Institute of Experimental and Applied Physics > Chair Professor Weiss > Group Dieter Weiss
Physics > Institute of Experimental and Applied Physics > Chair Professor Weiss > Group Christoph Strunk
|Projects:||GRK 1570, Elektronische Eigenschaften von Nanostrukturen auf Kohlenstoff-Basis|
|Subjects:||500 Science > 530 Physics|
|Refereed:||Yes, this version has been refereed|
|Created at the University of Regensburg:||Yes|
|Deposited On:||16 May 2012 10:28|
|Last Modified:||22 May 2012 07:57|