Optogenetics-Inspired Tunable Synaptic Functions in Memristors
Optogenetics-Inspired Tunable Synaptic Functions in Memristors
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DOI：
10.1021/acsnano.7b07317
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发表时间：
2018-02-01
期刊：
影响因子：
17.1
通讯作者：
Lu，Wei D.
中科院分区：
文献类型：
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作者：
Zhu，Xiaojian;Lu，Wei D.
具有内部Ca2+样动力学的双端忆阻器可用于忠实地模拟生物突触功能，并已被广泛研究用于神经网络实现。受光遗传学技术的启发，利用光来调节Ca2+动力学和随后的突触可塑性，我们开发了一种基于CH3NH3PbI3（MAPbI3）的忆阻器，该忆阻器具有光可调的突触行为。具体来说，我们表明，通过增加碘空位（VI·/ vix）的形成能，光照可以用来控制VI·/VI×generation和湮灭动力学，类似于光控制生物突触中的Ca2+内流。我们证明了记忆电阻的记忆形成和记忆丢失行为可以通过控制照明光的强度和波长来改变。电和光刺激的一致性检测也在记忆装置中实现，对光照的实时响应（≤20 ms）。这些结果为修改基于忆阻器的神经形态系统中的突触可塑性效应提供了选择，并可能导致能够忠实地模拟各种生物过程的电子系统的发展。
Two-terminal memristors with internal Ca2+-like dynamics can be used to faithfully emulate biological synaptic functions and have been intensively studied for neural network implementations. Inspired by the optogenetic technique that utilizes light to tune the Ca2+dynamics and subsequently the synaptic plasticity, we develop a CH3NH3PbI3(MAPbI3)-based memristor that exhibits light-tunable synaptic behaviors. Specifically, we show that by increasing the formation energy of iodine vacancy (VI·/VI×), light illumination can be used to control the VI·/VI×generation and annihilation dynamics, resembling light-controlled Ca2+influx in biological synapses. We demonstrate that the memory formation and memory loss behaviors in the memristors can be modified by controlling the intensity and the wavelength of the illuminated light. Coincidence detection of electrical and light stimulations is also implemented in the memristive device with real-time (≤20 ms) response to light illumination. These results open options to modify the synaptic plasticity effects in memristor-based neuromorphic systems and can lead to the development of electronic systems that can faithfully emulate diverse biological processes.