We report magnetic resonance spectroscopy measurements of individual nuclear spins in a crystal coupled to a neighbouring paramagnetic center, detected using microwave fluorescence at millikelvin temperatures. We observe real-time quantum jumps of the nuclear spin state, a proof of their individual nature. By driving the forbidden transitions of the coupled electron-nuclear spin system, we also achieve single-spin solid-effect dynamical nuclear polarization. Relying exclusively on microwave driving and microwave photon counting, the methods reported here are in principle applicable to a large number of electron-nuclear spin systems, in a wide variety of samples.
@article{arxiv.2408.14282,
title = {All-microwave spectroscopy and polarization of individual nuclear spins in a solid},
author = {J. Travesedo and J. O'Sullivan and L. Pallegoix and Z. W. Huang and P. Hogan and P. Goldner and T. Chaneliere and S. Bertaina and D. Esteve and P. Abgrall and D. Vion and E. Flurin and P. Bertet},
journal= {arXiv preprint arXiv:2408.14282},
year = {2024}
}