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  • Title: Optical probing of the spin polarization of the ν=5/2 quantum Hall state.
    Author: Stern M, Plochocka P, Umansky V, Maude DK, Potemski M, Bar-Joseph I.
    Journal: Phys Rev Lett; 2010 Aug 27; 105(9):096801. PubMed ID: 20868182.
    Abstract:
    We apply polarization resolved photoluminescence spectroscopy to measure the spin polarization of a two dimensional electron gas in perpendicular magnetic field. We find that the splitting between the σ+ and σ- polarizations exhibits a sharp drop at ν=5/2 and is equal to the bare Zeeman energy, which resembles the behavior at even filling factors. We show that this behavior is consistent with filling factor ν=5/2 being unpolarized.
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