Versatile Functionality of Four-Terminal TiO2-x Memristive Devices as Artificial Synapses for Neuromorphic Computing
Versatile Functionality of Four-Terminal TiO2-x Memristive Devices as Artificial Synapses for Neuromorphic Computing
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DOI：
10.1021/acsaelm.2c00161
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发表时间：
2022-05-24
影响因子：
4.7
通讯作者：
Sakai, Akira
中科院分区：
文献类型：
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作者：
Miyake, Ryotaro;Nagata, Zenya;Sakai, Akira
模拟生物突触和神经元活动的脑启发计算系统由于其解决冯·诺依曼瓶颈的潜在能力而变得越来越重要。已经提出了各种类型的忆阻器件来通过突触功能实现信息处理。然而，生物突触具有许多复杂的功能，例如异突触可塑性和相关的神经调节，这些功能由于需要多个输入而难以在传统的两端忆阻器中实现。在这项研究中，简单的四端忆阻器件组成的外延薄膜的TiO 2-x的制造和他们的能力，实现突触功能进行了探讨。这些设备利用二维变化的氧空位分布在TiO 2-x膜实现先进的异突触功能，包括可调尖峰定时依赖性可塑性，异突触可塑性模仿习惯化和敏化，巴甫洛夫条件反射，通过多端电压输入。目前的研究结果表明，我们的四端设备的惊人的多功能性，用于实现人工突触上的一个单一的忆阻无源元件的多样性和复杂的功能。
Brain-inspired computing systems, which emulate the activity of biological synapses and neurons, are becoming more and more essential owing to their potential ability to solve the von Neumann bottleneck. Various types of memristive devices have been proposed to achieve information processing through synaptic functions. However, biological synapses have many complicated functions, such as heterosynaptic plasticity and the related neuromodulation, that are difficult to implement in conventional twoterminal memristors because of the requirement for multiple inputs. In this study, simple four-terminal memristive devices consisting of epitaxial thin films of TiO2-x are fabricated and their capacity to implement synaptic functions are explored. These devices utilize the two-dimensional variation of the oxygen vacancy distribution in the TiO2-x film to realize advanced heterosynaptic functionality, including tunable spike-timing-dependent plasticity, heterosynaptic plasticity mimicking habituation and sensitization, and Pavlovian conditioning, through multiterminal voltage inputs. The present results demonstrate the striking versatility of our four-terminal device for implementing the diverse and complex functions of artificial synapses on a single memristive passive element.