Supplement Number 1, Supplement Number 2, Supplement Number 3, Supplement Number 4, Supplement Number 5, Supplement Number 6

See supplementary material Fig. S1 for additional information on the generation of metallic NPs using the gas condensation technique. In Fig. S2, the device area and temperature dependence of the LRS. Additionally, Section S3 contains the endurance protocol and Section S4 the data related to the cycle-to-cycle distribution. The switching kinetics of our devices are presented in Figs. S5 and S6.