Neuromimetic Circuits with Synaptic Devices based on Strongly Correlated Electron Systems

Abstract

Strongly correlated electron systems such as the rare-earth nickelates (RNiO3, R = rare-earth element) can exhibit synapse-like continuous long term potentiation and depression when gated with ionic liquids; exploiting the extreme sensitivity of coupled charge, spin, orbital, and lattice degrees of freedom to stoichiometry. We present experimental real-time, device-level classical conditioning and unlearning using nickelate-based synaptic devices in an electronic circuit compatible with both excitatory and inhibitory neurons. We establish a physical model for the device behavior based on electric-field driven coupled ionic-electronic diffusion that can be utilized for design of more complex systems. We use the model to simulate a variety of associate and non-associative learning mechanisms, as well as a feedforward recurrent network for storing memory. Our circuit intuitively parallels biological neural architectures, and it can be readily generalized to other forms of cellular learning and extinction. The simulation of neural function with electronic device analogues may provide insight into biological processes such as decision making, learning and adaptation, while facilitating advanced parallel information processing in hardware.

References in corpus (2)

• Origins of bad metal conductivity and the insulator-metal transition in the rare-earth nickelates
• Pavlov's dog associative learning demonstrated on synaptic-like organic transistors

Cited by in corpus (7)

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• Physics of ultrathin films and heterostructures of rare earth nickelates
• Tunable resistivity exponents in the metallic phase of epitaxial nickelates
• Electric-field control of oxygen vacancy and magnetic phase transition in cobaltite/manganite bilayer
• Monadic Pavlovian associative learning in a backpropagation-free photonic network
• The Mechanism of Electrolyte Gating on High-Tc Cuprates: The Role of Oxygen Migration and Electrostatics
• Conductivity noise across temperature driven transitions of rare-earth nickelate heterostructures