Optical Hall Effect in the Integer Quantum Hall Regime

Details Optical Hall Effect in the Integer Quantum Hall Regime Optical Hall Effect in the Integer Quantum Hall Regime

2010-04-02

arxiv.org/abs/1004.0308v2

Phys. Rev. Lett. 104, 256802 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.104.256802

Optical Hall conductivity $\sigma_{xy}(\omega)$ is measured from the Faraday rotation for a GaAs/AlGaAs heterojunction quantum Hall system in the terahertz frequency regime. The Faraday rotation angle ($\sim$ fine structure constant $\sim$ mrad) is found to significantly deviate from the Drude-like behavior to exhibit a plateau-like structure around the Landau-level filling $\nu=2$. The result, which fits with the behavior expected from the carrier localization effect in the ac regime, indicates that the plateau structure, although not quantized, still exists in the terahertz regime.

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