Wavelength-selective bipolar photoresponse in CVD-grown β-Bi 2 O 3 flakes for multi-logic functionality

system, modulated by the excitation wavelength, highlights the interplay among photon energy, defect states, electron-phonon interaction, and lattice anharmonicity. By harnessing the coexistence of positive and negative photoconductive effects within a single device and solely modulating the illumination wavelength, we realize all seven fundamental logic gates without changing the device geometry or electrical biasing. This work establishes a compact and reconfigurable approach for wavelength-controlled optoelectronic logic operations, offering a viable pathway toward oxide-based in-sensor computing and multifunctional photonic logic systems.