Signatures of hyperfine effects in isotopically purified ¹³C graphene

The hyperfine interaction (HFI) between electron spins and nuclear spins can act as an undesirable dephasive perturbation on the electronic system. At the same time, it can provide a wealth of information when used as an experimental probing technique. In graphene, nuclear effects are usually neglected due to the low natural abundance (1.1 %) of the spin carrying isotope ¹³C and the p-orbital character of carriers. Still, the magnitude of the HFI in graphene is subject to controversy and yet to be resolved. In this presentation, I will address interaction effects between the nuclear magnetic moments and the electronic system in isotopically purified ¹³C graphene. We find signatures of nuclear spin induced effects in the analysis of the weak localization phenomenon and in electron spin resonance measurements. These results show possible routes to assess hyperfine effects in van der Waals materials and to investigate the HFI in graphene in further detail.