Spin polarization of Quantum Hall states for filling factors 1 < v < 2 measured with microcavity polaritons

Abstract

Spin polarization measurements were performed in three 2D Electron Gases in GaAs with densities n = 9.1, 7.2 and 6.5 x10^10 cm-2, in the quantum Hall regime. Full spin polarization at v = 1 surrounded by rapid depolarization due to Skyrmion formation was observed in all devices, consistent with past measurements. Depolarization of the v = 4/3, 8/5 states and repolarization of the v = 5/3 state was also measured, in remarkable agreement with a non-interacting, disorder-free Composite Fermion model. Optical power and temperature dependent measurements of the v = 1 state suggest a regime of non-linear optics.

References in corpus (12)

• Exciton-polariton condensates
• Evidence of Skyrmion excitations about $\nu =1$ in n-Modulation Doped Single Quantum Wells by Inter-band Optical Transmission
• Quantum correlations of confined exciton-polaritons
• Unraveling the spin polarization of the v = 5/2 fractional quantum Hall state
• Polaron-Polaritons in the Integer and Fractional Quantum Hall Regimes
• Nonlinear optics in the fractional quantum Hall regime
• Optical absorption to probe the quantum Hall ferromagnet at filling factor $\nu =1$
• Disorder and interactions in quantum Hall ferromagnets near $\nu =1$
• Direct observation of composite fermions and their fully spin-polarized Fermi sea near $\nu =5/2$
• Complete spin phase diagram of the fractional quantum Hall liquid
• Spin Reversal of a Quantum Hall Ferromagnet at a Landau Level Crossing
• Disorder-induced stabilization of the quantum Hall ferromagnet