Interlayer Diffusion of Nuclear Spin Polarization in $ν=2/3$ Quantum Hall States

Minh-Hai Nguyen, Shibun Tsuda, Daiju Terasawa, Akira Fukuda, Yangdong Zheng, Anju Sawada

Published 2013-09-20Version 1

At the spin transition point of $\nu=2/3$ quantum Hall states, nuclear spins in a two-dimensional electron gas are polarized by an electric current. Using GaAs/AlGaAs double-quantum-well samples, we first observed the spatial diffusion of nuclear spin polarization between the two layers when the nuclear spin polarization is current-induced in one layer. By numerical simulation, we estimated the diffusion constant of the nuclear spin polarization to be $15 \pm 7$\,nm$^2$/s.