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The hyperfine interaction between the spins of electrons and nuclei is both ablessing and a curse. It can provide a wealth of information when used as anexperimental probing technique but it can also be destructive when it acts as adephasive perturbation on the electronic system. In this work, we fabricatedlarge scale single and multilayer isotopically-purified $^{13}$C graphene Hallbars to search for interaction effects between the nuclear magnetic moments andthe electronic system. We find signatures of nuclei with a spin in the analysisof the weak localization phenomenon that shows a significant dichotomy in thescattering times of monolayer $^{12}$C and $^{13}$C graphene close the Diracpoint. Microwave-induced electron spin flips were exploited to transfermomentum to the nuclei and build-up a nuclear field. The presence of a veryweak nuclear field is encoded in a modulation of the electron Zeeman energywhich shifts the energy for resonant absorption and reduces the $g$-factor.

Nuclear-induced dephasing and signatures of hyperfine effects in isotopically purified $^{13}$C graphene