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By using an electrochemical gating technique with a new combination ofpolymer and electrolyte, we were able to inject surface charge densities n_2Das high as 3.5 \times 10^15 e/cm^2 in gold films and to observe large relativevariations in the film resistance, DeltaR/R', up to 10% at low temperature.DeltaR/R' is a linear function of n_2D - as expected within a free-electronmodel - if the film is thick enough (> 25 nm), otherwise a tendency tosaturation due to size effects is observed. The application of this techniqueto 2D materials will allow extending the field-effect experiments to a range ofcharge doping where giant conductance modulations and, in some cases, even theoccurrence of superconductivity are expected.

Large conductance modulation of gold thin films by huge charge injection via electrochemical gating