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Article Dans Une Revue Physical Review Letters Année : 2009

Optical absorption to probe the quantum Hall ferromagnet at filling factor $\nu=1$

Résumé

Optical absorption measurements are used to probe the spin polarization in the integer and fractional quantum Hall effect regimes. The system is fully spin polarized only at filling factor $\nu=1$ and at very low temperatures($\sim40$ mK). A small change in filling factor ($\delta\nu\approx\pm0.01$) leads to a significant depolarization. This suggests that the itinerant quantum Hall ferromagnet at $\nu=1$ is surprisingly fragile against increasing temperature, or against small changes in filling factor.

Dates et versions

hal-00439964 , version 1 (09-12-2009)

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Paulina Plochocka, Johannes M. Schneider, Duncan Kennedy Maude, Marek Potemski, M. Rappaport, et al.. Optical absorption to probe the quantum Hall ferromagnet at filling factor $\nu=1$. Physical Review Letters, 2009, 102, pp.126806. ⟨hal-00439964⟩
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