Observation of a new phase transition between fully and partially polarized quantum Hall states with charge and spin gaps at $\nu =2/3$

Abstract

The average electron spin-polarization $\mathcal{P}$ of two-dimensional electron gas confined in $GaAs/GaAlAs$ multiple quantum-wells was measured by nuclear magnetic resonance (NMR) near the fractional quantum Hall state with filling factor $\nu =2/3$. Above this filling factor ($2/3\le \nu <0.85$), a strong depolarization is observed corresponding to two spin flips per additional flux quantum. The most remarkable behavior of the polarization is observed at $\nu =2/3$, where a quantum phase transition from a partially polarized ($\mathcal{P}\approx 3/4$) to a fully polarized ($\mathcal{P}=1$) state can be driven by increasing the ratio between the Zeeman and the Coulomb energy above a critical value ${\eta }_c=\frac{{\Delta }_Z}{{\Delta }_C}=0.0185$.

4 pages including 4 figures

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