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24 April 2024

» arxiv » 0901.3959

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Optical absorption to probe the quantum Hall ferromagnet at filling factor $ u=1$
P. Plochocka ; J. M. Schneider ; D. K. Maude ; M. Potemski ; M. Rappaport ; V. Umansky ; I. Bar-Joseph ; J. G. Groshaus ; Y. Gallais ; A. Pinczuk ;
Date:	26 Jan 2009
Abstract:	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 $ u=1$ and at very low temperatures ($sim40$ mK). A small change in filling factor ($delta uapproxpm0.01$) leads to a significant depolarization. This suggests that the itinerant quantum Hall ferromagnet at $ u=1$ is surprisingly fragile against increasing temperature, or against small changes in filling factor.
Source:	arXiv, 0901.3959
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