Superconducting Transition Temperature Modulation in NbN via EDL Gating

Abstract

We perform electric double-layer gating experiments on thin films of niobium nitride. Thanks to a cross-linked polymer electrolyte system of improved efficiency, we induce surface charge densities as high as $\approx 2.8\times 10^{15}{\mathrm{cm}}^{-2}$ in the active channel of the devices. We report a reversible modulation of the superconducting transition temperature (either positive or negative depending on the sign of the gate voltage) whose magnitude and sign are incompatible with the confinement of the perturbed superconducting state to a thin surface layer, as would be expected within a naïve screening model.

5 pages, 3 figures

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