Missaoui Ahmed, Khabthani Jouda Jemaa, Jaidane Nejm-Eddine, Mayou Didier, Trambly de Laissardière Guy
Laboratoire de Spectroscopie Atomique Moléculaire et Applications, Département de Physique, Faculté des Sciences de Tunis, Université de Tunis El Manar, Campus Universitaire 1060 Tunis, Tunisia.
J Phys Condens Matter. 2018 May 16;30(19):195701. doi: 10.1088/1361-648X/aaba06. Epub 2018 Mar 27.
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 [Formula: see text] 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 [Formula: see text]. 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.
