Optical fingerprints across the strain-driven semi-Dirac transition in Kekul'e-O graphene
The study investigates how strain changes Kekulé-O graphene's electronic structure, leading to a transition from a gapped state to a semi-Dirac phase. This transition creates distinct optical fingerprints: gapped peaks, semi-Dirac scaling, and van Hove resonances. These fingerprints reveal how the material's light interaction evolves as its band structure reconstructs under strain.