Magnetic field induced delocalization in hybrid electron-nuclear spin ensembles

We use field-cycling-assisted dynamic nuclear polarization and continuous radio-frequency (RF) driving over a broad spectral range to demonstrate magnetic-field-dependent activation of spin transport from strongly hyperfine-coupled $^{13}\mathrm{C}$ sites in diamond. interpret our observations with the help theoretical framework where interactions are mediated by electron spins. In particular, we build on results four-spin toy model show how otherwise localized spins must thermalize as they brought contact larger ancilla network. Further, probing system response variable field amplitude, witness stark changes RF-absorption spectrum, which partly due contributions heterogeneous multispin sets, whose zero-quantum transitions become RF active thanks hybrid electron-nuclear nature system. These findings could prove relevant applications polarization, spin-based quantum information processing, nanoscale sensing.