NMR determination of 2D electron spin polarization at ν = 1/2

S. Melinte, N. Freytag, M. Horvatic, C. Berthier, L. P. Lévy, V. Bayot, M. Shayegan

Research output: Contribution to journalArticle

82 Scopus citations

Abstract

Using a “standard” NMR spin-echo technique we determined the spin polarization P of two-dimensional electrons, confined to GaAs quantum wells, from the hyperfine shift of Ga nuclei located in the wells. Concentrating on the temperature (0.05 ≲ T ≲ 10K) and magnetic field (7 ≲ B ≲ 17T) dependencies of P at Landau level filling factor ν = 1/2, we find that the results are described well by a simple model of noninteracting composite fermions, although some inconsistencies remain when the two-dimensional electron system is tilted in the magnetic field.

Original languageEnglish (US)
Pages (from-to)354-357
Number of pages4
JournalPhysical review letters
Volume84
Issue number2
DOIs
StatePublished - Jan 1 2000

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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