Optical absorption to probe the quantum Hall ferromagnet at filling factor $\nu =1$

Abstract

Optical absorption measurements are used to probe the spin polarization in the integer and fractional quantum Hall effect regimes. The system is fully spin polarized only at filling factor $\nu =1$ and at very low temperatures($\sim 40$ mK). A small change in filling factor ($\delta \nu \approx \pm 0.01$) leads to a significant depolarization. This suggests that the itinerant quantum Hall ferromagnet at $\nu =1$ is surprisingly fragile against increasing temperature, or against small changes in filling factor.

4 pages, 2 figures

References in corpus (13)

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Cited by in corpus (21)

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• Magnetism and correlations in fractionally filled degenerate shells of graphene quantum dots
• Tuning Energy Relaxation along Quantum Hall Channels
• Shubnikov-de Haas oscillations in optical conductivity of monolayer MoSe${}_2$
• Chargeless heat transport in the fractional quantum Hall regime
• Polaron-Polaritons in the Integer and Fractional Quantum Hall Regimes
• Extra Spin-Wave mode in Quantum Hall systems. Beyond the Skyrmion Limit
• Slow spin relaxation in a quantum Hall ferromagnet state
• Non-equilibrium fractional quantum Hall states visualized by optically detected MRI
• Spin Reversal of a Quantum Hall Ferromagnet at a Landau Level Crossing
• Goldstone mode stochastization in quantum Hall ferromagnet
• Dispersive line shape in the vicinity of the ν = 1 quantum Hall state: Coexistence of Knight shifted and unshifted resistively detected NMR responses
• Disorder-induced stabilization of the quantum Hall ferromagnet
• The Local Incompressibility of Fractional Quantum Hall States at a Filling Factor of 3/2
• Optical excitations in compressible and incompressible two-dimensional electron liquids
• Circularly Polarized Resonant Rayleigh Scattering and Skyrmions in the $\nu$ = 1 Quantum Hall Ferromagnet
• Time, momentum, and energy resolved pump-probe tunneling spectroscopy of two-dimensional electron systems
• The Effect of Disorder in Superfluid Double Layer Graphene
• Spontaneous Transition to a Correlated Phase of Skyrmions Observed in Real Space
• Spin polarization of Quantum Hall states for filling factors 1 < v < 2 measured with microcavity polaritons