Abstract
<h2>Summary</h2> Ionic Coulomb blockade is one of the ion transport phenomena revealing the quantized nature of ionic charges, which is of crucial importance to our understanding of the sub-continuum transport in nanofluidics and the mechanism of biological ion channels. Here, we report an experimental observation and plausible theoretical reasoning of ionic conduction oscillations. Our experiment is performed under confinement in sub-nanometer (sub-nm) MoS<sub>2</sub> pores with optoelectronic control enabled for active tuning of pore surface charges. Under this charge control, we measure the ionic current at fixed voltages and observe multiple current peaks. Our analytical discussions and molecular dynamics simulations further reveal that the conductance oscillations may originate from the multi-ion interaction at the pore entry, particularly the electrostatic repulsion of ions external to the pore by ions bound inside the pore. Our work adds a further understanding of ionic Coulomb blockade effect and paves the way for developing advanced ionic machineries.
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