Chiroferromagnetic Quantum Dots for Chiroptical Synapse (ChiropS)

Optoelectronic devices using circularly polarized light (CPL) integration holds immense promise, offering enhanced sensitivity and specificity crucial for efficient data processing. With that, there has been growing needs in CPL sensing medium that processes strong optical activity, high stability and sensitivity, multi transition bands and environmental compatibility. Here, defect-engineered chiroferromagnetic quantum dots (CFQDs) are used as a new type of circularly polarized light (CPL) sensing material. By inducing amorphization defects using chiral molecules, CFQDs with a high density of unpaired electrons, atomic structural chirality, amplified chiroptical activity, and multiple exciton transition bands were obtained. The use of CFQDs as CPL sensing medium enables nonlinear long-term plastic behavior with linear optical input of the optoelectronic device, chiroptical synapse, which makes chiral quantum dot as in situ noise filters that facilitate over 20% noise reduction. Our CFQDs also provide over nine times higher integration for photon polarization and wavelength distinctions owing to their unique electric structures, which promises next-generation processors with enhanced energy efficiency, integration, and reduced retention time.