Modeling of emergent memory and voltage spiking in ionic transport through angstromscale slits
Abstract
Recent advances in nanofluidics have enabled the confinement of water down to a single molecular layer. Such monolayer electrolytes show promise in achieving bioinspired functionalities through molecular control of ion transport. However, the understanding of ion dynamics in these systems is still scarce. Here, we develop an analytical theory, backed up by molecular dynamics simulations, that predicts strongly nonlinear effects in ion transport across quasi–twodimensional slits. We show that under an electric field, ions assemble into elongated clusters, whose slow dynamics result in hysteretic conduction. This phenomenon, known as the memristor effect, can be harnessed to build an elementary neuron. As a proof of concept, we carry out molecular simulations of two nanofluidic slits that reproduce the HodgkinHuxley model and observe spontaneous emission of voltage spikes characteristic of neuromorphic activity.
 Publication:

Science
 Pub Date:
 August 2021
 DOI:
 10.1126/science.abf7923
 arXiv:
 arXiv:2105.07904
 Bibcode:
 2021Sci...373..687R
 Keywords:

 CHEMISTRY; PHYSICS;
 Condensed Matter  Soft Condensed Matter;
 Condensed Matter  Statistical Mechanics
 EPrint:
 Science, 2021, vol. 373, no 6555, p. 687691