What is it about?
Hetero-synaptic functions such as associative learning (e.g. Pavlov’s dog experiment) are demonstrated in the rutile TiO2 (titania) single crystal memristor. The device utilizes two-dimensional redistribution of electronic carriers controlled by multi-terminal inputs.
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Why is it important?
Diverse and complex synaptic functions such as hetero-synaptic plasticity, STDP or associative learning (e.g. Pavlovian conditioning) are implemented by a single multi-terminal passive element; memristor. The use of single crystal (or amorphous) oxide is the key for the reversible drift motion of dopants (oxygen vacancies) and resistive-change of the device. It can be applied for a novel non-volatile memory (ReRAM) or neuromorphic AI computing device with tunable synaptic plasticity.
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This page is a summary of: Versatile Functionality of Four-Terminal TiO2–x Memristive Devices as Artificial Synapses for Neuromorphic Computing, ACS Applied Electronic Materials, April 2022, American Chemical Society (ACS),
DOI: 10.1021/acsaelm.2c00161.
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Resources
High‑temperature operation of gallium oxide memristors up to 600 K
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Crystalline Microstructure and Versatile Resistive Switching Property in Rutile TiO2-x Four-Terminal Memristors
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Gate Tuning of Synaptic Functions Based on Oxygen Vacancy Distribution Control in Four-Terminal TiO2−x Memristive Devices
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Demonstrative operation of four-terminal memristive devices fabricated on reduced TiO2 single crystals
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Analysis of Ti valence states in resistive switching regions of a rutile TiO2−x four-terminal memristive device
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