Berlin 2024 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 29: Poster II

MM 29.22: Poster

Dienstag, 19. März 2024, 17:00–19:00, Poster B

Computational elements based on coupled VO2 oscillators via tunable thermal triggering — •Guanmin Li, Zhong Wang, Yuliang Chen, Jae-Chun Jeon, and Stuart S. P. Parkin — Max Planck Institute of Microstructure Physics, Weinberg 2, 06120 Halle (Saale), Germany

Computational technologies based on coupled oscillators are of great interest for energy efficient computing. A key to the development of such technologies is the tunable control of the interaction strength between the oscillators. Thus far, such coupled oscillators have been accomplished by additional external electronic components.

Here we show that the synchronization of closely spaced vanadium dioxide (VO2) oscillators can be controlled via a thermal triggering element that itself is formed from VO2. Thereby, we demonstrate the active tuning of coupled oscillation states between adjacent VO2 devices via a thermal cell that is placed between them. This tuning process allows the control of the amplitude, frequency and phase of the coupled VO2 oscillators. Moreover, we show that the net energy consumed by these oscillators is lower when their oscillatory states are coupled thermally than when they oscillate independently of one another. This frequency synchronization process is similar to the propagation of signals from pre-synaptic to post-synaptic neurons via the release of neurotransmitters. Our findings demonstrate that networks of thermally coupled oscillators allow for novel bio-inspired computational schemes.

Keywords: Vanadium dioxide; Strongly correlated oxide; Synchronized oscillators; Tunable coupling; Energy-efficient