The resistivity change due to electron spin resonance (ESR) absorption is investigated in a high-mobility two-dimensional electron system formed in a Si/SiGe heterostructure. Results for a specific Landau level configuration demonstrate that the primary cause of the ESR signal is a reduction of the spin polarization, not the effect of electron heating. The longitudinal spin relaxation time T_1 is obtained to be of the order of 1 ms in an in-plane magnetic field of 3.55 T. The suppression of the effect of the Rashba fields due to high-frequency spin precession explains the very long T_1.
Cite
@article{arxiv.cond-mat/0512041,
title = {Electrically detected electron spin resonance in a high mobility silicon quantum well},
author = {Junya Matsunami and Mitsuaki Ooya and Tohru Okamoto},
journal= {arXiv preprint arXiv:cond-mat/0512041},
year = {2007}
}