Fig. 4: Thermal spike driven VO2 oscillation with different firing modes.
From: Computational elements based on coupled VO2 oscillators via tunable thermal triggering
a Optical image of the VO2 device set used for the generation of a spiking potential. Cell 1, cell 2, and the thermal cell are excited by three independent current sources. b Oscillation waveform when cell 1 is excited at 3.9 mA, cell 2 is excited at 4.0 mA, and thermal cell is activated at 2.3 mA. c Output waveform from cell 2 that is generated by the cascade synchronization among three cells. This behavior mimics the generation of the spiking potential in a neuron when it is stimulated; Region-1: Resting state; Region-2: Stimulation arrives; Region-3: Depolarization state; Region-4: Repolarization and hyperpolarization state (also known as refractory period) as discussed in refs. 7,33,34. d Different firing modes of the VO2 neuron by simply changing the current of cell 1 (I1 from 1 mA to 5.2 mA), while keeping the current to cell 2 (I2 = 4 mA) and the thermal cell (Icell = 2.3 mA) fixed.
