NMR Determination of 2D Electron Spin Polarization at $ν=1/2$

Details NMR Determination of 2D Electron Spin Polarization at $ν=1/2$ NMR Determination of 2D Electron Spin Polarization at $ν=1/2$

1999-08-06

arxiv.org/abs/cond-mat/9908098v3

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages (REVTEX) AND 4 figures (PS)

Scientific paper

10.1103/PhysRevLett.84.354

Using a `standard' NMR spin-echo technique we determined the spin polarization of two-dimensional electrons, confined to GaAs quantum wells, from the hyperfine shift of Ga nuclei in the wells. Concentrating on the temperature and magnetic field dependencies of spin polarization at Landau level filling factor $\nu =1/2$, we find that the results are described well by a simple model of non-interacting composite fermions, although some inconsistencies remain when the two-dimensional electron system is tilted in the magnetic field.

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