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Phys Rev Lett. 2012 Feb 10;108(6):066810. Epub 2012 Feb 10.

NMR probing of the spin polarization of the ν=5/2 quantum Hall state.

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Department of Condensed Matter Physics, The Weizmann Institute of Science, Rehovot, Israel.


Resistively detected nuclear magnetic resonance is used to measure the Knight shift of the 75As nuclei and determine the electron spin polarization of the fractional quantum Hall states of the second Landau level. We show that the 5/2 state is fully polarized within experimental error, thus confirming a fundamental assumption of the Moore-Read theory. We measure the electron heating under radio frequency excitation and show that we are able to detect NMR at electron temperatures down to 30 mK.

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