Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2011-01-25
European Physics Letters 94, 47006 (2011)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
8 pages, 5 figures
Scientific paper
10.1209/0295-5075/94/47006
We report a theoretical low-field magnetotransport study unveiling the effect of pseudospin in realistic models of weakly disordered graphene-based materials. Using an efficient Kubo computational method, and simulating the effect of charges trapped in the oxide, different magnetoconductance fingerprints are numerically obtained in system sizes as large as 0.3 micronmeter squared, containing tens of millions of carbon atoms. In two-dimensional graphene, a strong valley mixing is found to irreparably yield a positive magnetoconductance (weak localization), whereas crossovers from positive to a negative magnetoconductance (weak antilocalization) are obtained by reducing disorder strength down to the ballistic limit. In sharp contrast, graphene nanoribbons with lateral size as large as 10nm show no sign of weak antilocalization, even for very small disorder strength. Our results rationalize the emergence of a complex phase diagram of magnetoconductance fingerprints, shedding some new light on the microscopical origin of pseudospin effects.
Cresti Alessandro
Montambaux Gilles
Ortmann Frank
Roche Stephan
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