Nuclear Magnetometry Study of Spin Dynamics in Bilayer Quantum Hall Systems

M. H. Fauzi, S. Watanabe, Y. Hirayama

Published 2014-05-13, updated 2014-10-21Version 2

We performed a nuclear magnetometry study on quantum Hall ferromagnet with a bilayer total filling factor of $\nu_{\rm{tot}} = 2$. We found not only a rapid nuclear relaxation but also a sudden change in the nuclear spin polarization distribution after a one-second interaction with a canted antiferromagnetic phase. We discuss the possibility of observing cooperative phenomena coming from nuclear spin ensemble triggered by electrons with collective spin interactions.