title: Tunable superconducting phase transition in metal-decorated graphene sheets.
abstract: We have produced graphene sheets decorated with a nonpercolating network of nanoscale tin clusters. These metal clusters both efficiently dope the graphene substrate and induce long-range superconducting correlations. We find that despite structural inhomogeneity on mesoscopic length scales (10-100 nm), this material behaves electronically as a homogenous dirty superconductor with a field-effect tuned Berezinskii-Kosterlitz-Thouless transition. Our facile self-assembly method establishes graphene as an ideal tunable substrate for studying induced two-dimensional electronic systems at fixed disorder and our technique can readily be extended to other order parameters such as magnetism.
authors.affiliation: Department of Physics, University of California at Berkeley, Berkeley, California 94720, USA.
authors.forename: B M
authors.initials: BM
authors.lastname: Kessler
authors.forename: C O
authors.initials: CO
authors.lastname: Girit
authors.forename: A
authors.initials: A
authors.lastname: Zettl
authors.forename: V
authors.initials: V
authors.lastname: Bouchiat