title: Optical Hall effect in the integer quantum Hall regime.
abstract: Optical Hall conductivity σ{xy}(ω) is measured from the Faraday rotation for a GaAs/AlGaAs heterojunction quantum Hall system in the terahertz-frequency regime. The Faraday rotation angle (∼ fine-structure constant ∼ mrad) is found to significantly deviate from the Drude-like behavior to exhibit a plateaulike structure around the Landau-level filling ν=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.
authors.affiliation: Department of Physics, The University of Tokyo, Hongo, Tokyo 113-0033, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Ikebe
authors.forename: T
authors.initials: T
authors.lastname: Morimoto
authors.forename: R
authors.initials: R
authors.lastname: Masutomi
authors.forename: T
authors.initials: T
authors.lastname: Okamoto
authors.forename: H
authors.initials: H
authors.lastname: Aoki
authors.forename: R
authors.initials: R
authors.lastname: Shimano