We investigate the electron spin states in the bilayer quantum Hall system at total Landau level filling factor nu =2 exploiting current-pumped and resistively detected NMR. The measured Knight shift, KS, of 75As nuclei reveals continuous variation of the out-of-plane electronic spin polarization between nearly full and zero as a function of density imbalance. Nuclear spin relaxation measurements indicate a concurrent development of an in-plane spin component. These results provide direct information on the spin configuration in this system and comprise strong evidence for the spin canting suggested by previous experiments.
@article{arxiv.0707.1359,
title = {NMR Evidence for Spin Canting in a Bilayer nu = 2 Quantum Hall System},
author = {N. Kumada and K. Muraki and Y. Hirayama},
journal= {arXiv preprint arXiv:0707.1359},
year = {2009}
}