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

Details Optical absorption to probe the quantum Hall ferromagnet at filling factor $ν=1$ Optical absorption to probe the quantum Hall ferromagnet at filling factor $ν=1$

2009-01-26

arxiv.org/abs/0901.3959v2

Phys. Rev. Lett. 102, 126806 (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 2 figures

Scientific paper

10.1103/PhysRevLett.102.126806

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.

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