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25 April 2024

» arxiv » 1005.3112

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Optical Probing of the Spin Polarization of the nu=5/2 Quantum Hall State
M. Stern ; P. Plochocka ; V. Umansky ; D. K. Maude ; M. Potemski ; I. Bar-Joseph ;
Date:	18 May 2010
Abstract:	We apply polarization resolved photoluminescence spectroscopy to measure the spin polarization of a two dimensional electron gas in perpendicular magnetic field. In the vicinity of filling factor nu=5/2, we observe a sharp discontinuity in the energy of the zero Landau level emission line. We find that the splitting between the two circular polarizations exhibits a sharp drop at nu=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 nu=5/2 being unpolarized.
Source:	arXiv, 1005.3112
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