title: Large conductance modulation of gold thin films by huge charge injection via electrochemical gating.
abstract: By using an electrochemical gating technique with a new combination of polymer and electrolyte, we were able to inject surface charge densities n(2D) as high as 3.5×10(15)  e/cm(2) in gold films and to observe large relative variations in the film resistance, ΔR/R', up to 10% at low temperature. ΔR/R' is a linear function of n(2D)-as expected within a free-electron model-if the film is thick enough (≥25  nm); otherwise, a tendency to saturation due to size effects is observed. The application of this technique to 2D materials might allow extending the field-effect experiments to a range of charge doping where large conductance modulations and, in some cases, even the occurrence of superconductivity are expected.
authors.affiliation: Dipartimento di Fisica, Politecnico di Torino, 10129 Torino, Italy.
authors.forename: D
authors.initials: D
authors.lastname: Daghero
authors.forename: F
authors.initials: F
authors.lastname: Paolucci
authors.forename: A
authors.initials: A
authors.lastname: Sola
authors.forename: M
authors.initials: M
authors.lastname: Tortello
authors.forename: G A
authors.initials: GA
authors.lastname: Ummarino
authors.forename: M
authors.initials: M
authors.lastname: Agosto
authors.forename: R S
authors.initials: RS
authors.lastname: Gonnelli
authors.forename: Jijeesh R
authors.initials: JR
authors.lastname: Nair
authors.forename: C
authors.initials: C
authors.lastname: Gerbaldi