Fast Spiking of a Mott VO2-Carbon Nanotube Composite Device.
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The recent surge of interest in brain-inspired computing and power-efficient electronics has dramatically bolstered development of computation and communication using neuron-like spiking signals. Devices that can produce rapid and energy-efficient spiking could significantly advance these applications. Here we demonstrate direct current or voltage-driven periodic spiking with sub-20 ns pulse widths from a single device composed of a thin VO2 film with a metallic carbon nanotube as a nanoscale heater, without using an external capacitor. Compared with VO2-only devices, adding the nanotube heater dramatically decreases the transient duration and pulse energy, and increases the spiking frequency, by up to 3 orders of magnitude. This is caused by heating and cooling of the VO2 across its insulator-metal transition being localized to a nanoscale conduction channel in an otherwise bulk medium. This result provides an important component of energy-efficient neuromorphic computing systems and a lithography-free technique for energy-scaling of electronic devices that operate via bulk mechanisms.
author list (cited authors)
Bohaichuk, S. M., Kumar, S., Pitner, G., McClellan, C. J., Jeong, J., Samant, M. G., ... Pop, E.
complete list of authors
Bohaichuk, Stephanie M||Kumar, Suhas||Pitner, Greg||McClellan, Connor J||Jeong, Jaewoo||Samant, Mahesh G||Wong, H-S Philip||Parkin, Stuart SP||Williams, R Stanley||Pop, Eric