Nuclear Magnetometry Study of Spin Dynamics in Bilayer Quantum Hall Systems

TL;DR

This study uses nuclear magnetometry to explore spin dynamics in bilayer quantum Hall systems, revealing rapid nuclear relaxation and sudden polarization changes linked to electron spin interactions.

Contribution

It introduces the observation of collective nuclear spin phenomena triggered by electron interactions in bilayer quantum Hall systems.

Findings

Rapid nuclear relaxation observed

Sudden change in nuclear spin polarization

Potential cooperative phenomena from nuclear-electron interactions

Abstract

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.