Emulating neural functions utilizing the larger time constants found in the operation of molecular-gap atomic switches

Naoya Wada, Tsuyoshi Hasegawa

Research output: Contribution to journalArticlepeer-review

Abstract

Using hardware to emulate biological functions is essential for the realization of more sophisticated brain-type information processing. For this purpose, up to now, various nonvolatile devices have been used to emulate complex functions such as spike-timing dependent plasticity. However, little research has been conducted on more complicated neural functions. In this study, we demonstrate neural functions such as paired-pulse facilitation (PPF) and paired-pulse depression (PPD), utilizing the larger time constant of the ionic diffusion found in molecular-gap atomic switches. Both the PPF and PPD emulated in this study are dependent on pulse intervals that are the same as those found in biological synapses. Simulations of how pulsed bias changes ion concentration at the subsurface, which in turn determines the precipitation/dissolution of metal atoms, provide a good explanation of the mechanisms of the PPF and the PPD observed in this study.

Original languageEnglish
Article numberSCCF01
JournalJapanese journal of applied physics
Volume60
Issue numberSC
DOIs
Publication statusPublished - 2021 Jun

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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