Mobility gap and quantum transport in a functionalized graphene bilayer

In a Bernal graphene bilayer, carbon atoms belong to two inequivalent sublattices A and B, with atoms that are coupled to the other layer by bonds belonging to sublattice A and the other atoms belonging to sublattice B. We analyze the density of states and the conductivity of Bernal graphene bilayer...

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Bibliographic Details
Published in:Journal of physics. Condensed matter 2018-05, Vol.30 (19), p.195701-195701
Main Authors: Missaoui, Ahmed, Khabthani, Jouda Jemaa, Jaidane, Nejm-Eddine, Mayou, Didier, Trambly de Laissardière, Guy
Format: Article
Language:English
Subjects:
electronic structure
functionalization
graphene bilayer
Physics
quantum transport
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Summary:In a Bernal graphene bilayer, carbon atoms belong to two inequivalent sublattices A and B, with atoms that are coupled to the other layer by bonds belonging to sublattice A and the other atoms belonging to sublattice B. We analyze the density of states and the conductivity of Bernal graphene bilayers when atoms of sublattice A or B only are randomly functionalized. We find that for a selective functionalization on sublattice B only, a mobility gap of the order of 0.5 eV is formed close to the Dirac energy at concentration of adatoms . In addition, at some other energies conductivity presents anomalous behaviors. We show that these properties are related to the bipartite structure of the graphene layer.
ISSN:0953-8984
1361-648X
DOI:10.1088/1361-648X/aaba06