Transport anomaly at the ordering transition for adatoms on graphene

Kopylov, Sergey and Cheianov, Vadim and Altshuler, Boris L. and Falko, Vladimir (2011) Transport anomaly at the ordering transition for adatoms on graphene. Physical review B, 83 (20): 201401. -. ISSN 1098-0121

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Abstract

We analyze a manifestation of the partial ordering transition of adatoms on graphene in resistivity measurements. We find that the Kekule mosaic ordering of adatoms increases the sheet resistance of graphene due to a gap opening in its spectrum and that critical fluctuations of the order parameter lead to a nonmonotonic temperature dependence of resistivity with a cusp-like minimum at T = T-c