We report the optical control of localized charge on positioned quantum dots in an electro-photosensitive memristor. Interband absorption processes in the quantum dot barrier matrix lead to photogenerated electron-hole-pairs that, depending on the applied bias voltage, charge or discharge the quantum dots and hence decrease or increase the conductance. Wavelength-dependent conductance control is observed by illumination with red and infrared light, which leads to charging via interband and discharging via intraband absorption. The presented memristor enables optical conductance control and may thus be considered for sensory applications in artificial neural networks as light-sensitive synapses or optically tunable memories.
Copyright © 2016 AIP Publishing. This article first appeared in Applied Physics Letters 109:2 (2016), 1-5.
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Maier, P., F. Hartmann, Mariama Rebello Sousa Dias, M. Emmerling, C. Schneider, L. K. Castelano, M. Kamp, G. E. Marques, V. Lopez-Richard, L. Worschech, and S. Höfling. "Light Sensitive Memristor with Bi-directional and Wavelength-dependent Conductance Control." Applied Physics Letters 109, no. 2 (2016): 1-5. doi:10.1063/1.4955464.