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Figure 9: (a) Schematics of graphene/CNT based ORRAM synaptic device. (b) STP: post-synaptic current stimulated with an optical pulse at various gate bias. (c) PPF index as a function of pulse interval. (d) LTP obtained by combining optical pulse and voltage pulse. (e) Illustration of STLR learning rule. (f) Illustration of STDP learning rule. Reproduced with permission from [54].