A novel approach of single-device VO2 oscillator for reconfigurable Boolean logic

Al-abassi, Salam and Neumann, Péter Lajos (2026) A novel approach of single-device VO2 oscillator for reconfigurable Boolean logic. RESULTS IN PHYSICS, 87. No. 108706. ISSN 2211-3797 (In Press)

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Abstract

Vanadium dioxide (VO2) exhibits a current-driven insulator–metal transition that gives rise to pronounced hysteresis and self-sustained relaxation oscillations under appropriate biasing, making it an attractive candidate for unconventional computing architectures. In this work, we demonstrate that a single triangular-channel VO2 device can be reconfigured to perform multiple Boolean logic operations by encoding logic states in the presence or absence of oscillations, without modifying the device structure or adding auxiliary logic circuitry. Using a dual-input current scheme, we first experimentally identify a well-defined oscillation window between 50 µA and 300 µA, within which the VO2 channel operates in its negative differential resistance regime. Logic “1” is defined by sustained oscillations at the output, while logic “0” corresponds to a quiescent (non-oscillatory) state when the device is either insulating or fully metallic. By appropriately selecting bias conditions for the two inputs, we experimentally realize AND, OR, XOR, and NOT logic functions in a single VO2 element. Additionally, these logic functions are validated through LTspice simulations using the same experimentally extracted threshold values. The triangular geometry of the VO2 channel plays a key role in stabilizing the oscillation window by enabling spatially distributed Joule heating and gradual phase evolution, thereby improving operational robustness. Our results highlight a compact and bias-programmable approach to logic implementation in phase-transition materials, offering a pathway toward minimal-device-count logic elements and hybrid Boolean-oscillatory computing architectures based on VO2.

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