Optical probing of the spin polarization of the ν=5/2 quantum hall state

M. Stern, P. Plochocka, V. Umansky, D. K. Maude, M. Potemski, I. Bar-Joseph

Research output: Contribution to journalArticlepeer-review

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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.

Original languageEnglish
Article number096801
JournalPhysical Review Letters
Volume105
Issue number9
DOIs
StatePublished - 23 Aug 2010
Externally publishedYes

Funding

FundersFunder number
Seventh Framework Programme221249

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