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Phys Chem Chem Phys. 2011 Dec 7;13(45):20208-14. doi: 10.1039/c1cp22250c. Epub 2011 Oct 12.

Enhanced weak localization effect in few-layer graphene.

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1
School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore 637371.

Abstract

We have investigated the weak localization correction to magnetoresistance in one to six layer graphene structures. The magnetoresistance measurements have revealed that, in addition to the known transition from weak anti-localization in monolayer graphene to weak localization in bilayer graphene, the weak localization effect becomes more pronounced as the number of graphene layers increases. The obtained results substantiate that because few-layer graphene suppresses mesoscopic corrugations and increases intervalley scattering it leads to the observed enhancement of negative resistance, resulting in the restoration of the weak localization in graphene materials. High field magnetoresistance measurements show non-linear behavior, which indicates the breaking of sub-lattice symmetry and the formation of excitonic gap in the Landau level.

PMID:
21993333
DOI:
10.1039/c1cp22250c
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