Tunable Superconducting Phase Transition in Metal-Decorated Graphene Sheets
Abstract
Using typical experimental techniques it is difficult to separate the effects of carrier density and disorder on the superconducting transition in two dimensions. Using a simple fabrication procedure based on metal layer dewetting, we have produced graphene sheets decorated with a non-percolating network of nanoscale tin clusters. These metal clusters both efficiently dope the graphene substrate and induce long-range superconducting correlations. This allows us to study the superconducting transition at fixed disorder and variable carrier concentration. We find that despite structural inhomogeneity on mesoscopic length scales (10-100 nm), this material behaves electronically as a homogenous dirty superconductor. Our simple 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.
Keywords
Cite
@article{arxiv.0907.3661,
title = {Tunable Superconducting Phase Transition in Metal-Decorated Graphene Sheets},
author = {B. M. Kessler and C. O. Girit and A. Zettl and V. Bouchiat},
journal= {arXiv preprint arXiv:0907.3661},
year = {2012}
}