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Schematic illustrations of possible conduction mechanisms that can induce a non-volatile increase (decrease) in the device’s conductance, corresponding to an LTP (LTD) response, as depicted in and( b) metastable transitions precede both cases, with potentiation (STP) captured respectively.A transition from volatile to non-volatile programming, as described in (b), is shown in (c) where identical voltage pulses initially trigger volatile switching and eventually a non-volatile state transition.a pulse applied pre-synaptically to the device’s top electrode (TE), shown in inset II of Fig. The post-synaptic current entering the artificial neuron, from the device’s bottom electrode (BE), is proportional to the memristive conductance.Figure 1a depicts a microphotograph of one of our fabricated crossbar type Ti O active core (cross-section is shown in inset II of Fig. Following an electroforming step (depicted in Figure S1), the devices’ electrical characteristics were first investigated via positive/negative ±2 V voltage sweeps, resulting into a bipolar mode of switching: positive sweeps cause low- (LRS) to high-resistive state (HRS) transitions, while negative ones cause HRS to LRS transitions.Nonetheless, in most cases the equivalence between the physics of memristive devices and the physics governing the behavior of biological synapses has been shown only at an abstract qualitative level.Here we focus on demonstrating how single Ti O used to validate the response of real synapses.The corresponding current-voltage (I-V) characteristics, with the classical pinched-hysteresis memristor signature is shown in the supplementary material Figure S2a.
2a we reproduce the classical form of short-term facilitation (here denoted as STP-F), where each input pulse has the effect of increasing the conductance, including its peak response.
Neuromorphic architectures offer great promise for achieving computation capacities beyond conventional Von Neumann machines.
The essential elements for achieving this vision are highly scalable synaptic mimics that do not undermine biological fidelity.
Moreover, they largely ignore the fact that synapses are inherently unreliable and there is often a large variance in their response to a specific signal, also apparent in short-term dynamics.
Among the several candidates for fabricating brain-like, neuromorphic systems, memristors are particularly promising: their characteristic signature of hysteresis is typically noticed in systems and devices that possess certain inertia, manifesting memory, including neural systems.