(Invited) Two-Terminal Selectors Enables Non-Volatile Memory and Neuromorphic Computing Applications

Abstract

Sneak current path issue is a critical challenge in memristor crossbar arrays used for non-volatile memory and neuromorphic computing, which can be mitigated by utilizing a selector device in series with each memristor. For this purpose, the selector needs to possess a highly nonlinear current-voltage characteristic. In addition, for neuromorphic computing applications, dynamics originated from cation diffusion process is crucial for the functions of synapses in intelligent bio-systems. Memristor has been a leading candidate to emulate synapse for neuromorphic computing. Due to the lack of such dynamics in a typical memristor, the emulation of memristor to a synapse has been function-specific and cumbersome.These dynamics can be readily incorporated into some selector devices that operates based on cation motion. The highly nonlinear current-voltage characteristic of the selectors enables a large scale crossbar array. Meanwhile, its dynamics with the same physical origin of its bio-counterpart lead to a natural, direct and comprehensive emulation of a variety of important synaptic functions.