Regensburg 2025 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 13: Poster

DS 13.17: Poster

Donnerstag, 20. März 2025, 18:00–20:00, P1

VO2 oscillator with advanced neuron-like feature originating from blinking filament — •Zhong Wang, Kajal Tiwari, Yishen Xie, Jae-Chun Jeon, Ke Xiao, and Stuart Parkin — Max Planck Institute of Microstructure Physics, Weinberg 2, 06120 Halle(Saale), Germany

The insulator-metal-transition of VO2 gives rise to the electric oscillation that has extensive applications in neuromorphic computing[1]. Although the oscillation feature is typically stable and deterministic, advanced neuromorphic applications require more complex and adaptive device properties[2]. Here we discover the neuron-like bursting with the non-deterministic separation time in the VO2 thin film-based device, which is only detectable in a narrow temperature range below transition. This feature of VO2 indicates the dynamical process beyond ordinary insulator-metal-transition and capacitive charging. By scanning near-field optical microscopy and modelling, we identify the flipping filament formation in multiple positions as the physical origin of the complex feature observed. Our work unveils the mechanism underlying VO2 oscillator that could assist future device design for neuromorphic computing.

[1] P. Schofield et al., Advanced Materials 35, 2205294 (2023).

[2] S. Kumar et al., Nature Reviews Materials 7, 575 (2022).

Keywords: VO2 oscillator; Filament; Neuromorphic computing; Insulator-metal-transition; Scanning near-field optical microscopy