We study spin relaxation and diffusion in an electron-spin ensemble of nitrogen impurities in diamond at low temperature (0.25-1.2 K) and polarizing magnetic field (80-300 mT). Measurements exploit mode- and temperature-dependent coupling of hyperfine-split sub-ensembles to the resonator. Temperature-independent spin linewidth and relaxation time suggest that spin diffusion limits spin relaxation. Depolarization of one sub-ensemble by resonant pumping of another indicates fast cross-relaxation compared to spin diffusion, with implications on use of sub-ensembles as independent quantum memories.
@article{arxiv.1208.5473,
title = {Probing dynamics of an electron-spin ensemble via a superconducting resonator},
author = {V. Ranjan and G. de Lange and R. Schutjens and T. Debelhoir and J. P. Groen and D. Szombati and D. J. Thoen and T. M. Klapwijk and R. Hanson and L. DiCarlo},
journal= {arXiv preprint arXiv:1208.5473},
year = {2013}
}
Comments
5 pages, 5 figures, and Supplementary Information (2 figures)