title: Optical probing of the spin polarization of the ν=5/2 quantum Hall state.
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.
authors.affiliation: Department of Condensed Matter Physics, The Weizmann Institute of Science, Rehovot, Israel. mstern@weizmann.ac.il
authors.forename: M
authors.initials: M
authors.lastname: Stern
authors.forename: P
authors.initials: P
authors.lastname: Plochocka
authors.forename: V
authors.initials: V
authors.lastname: Umansky
authors.forename: D K
authors.initials: DK
authors.lastname: Maude
authors.forename: M
authors.initials: M
authors.lastname: Potemski
authors.forename: I
authors.initials: I
authors.lastname: Bar-Joseph