Optical Hall Effect in the Integer Quantum Hall Regime
Optical Hall Effect in the Integer Quantum Hall Regime
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DOI：
10.1103/physrevlett.104.256802
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发表时间：
2010-06-23
影响因子：
8.6
通讯作者：
Shimano, R.
中科院分区：
文献类型：
--
作者：
Ikebe, Y.;Morimoto, T.;Shimano, R.
利用法拉第旋转法拉第测得了在太赫兹频率范围内GaAs/AlGaAs异质结量子霍尔系统的光学霍尔电导σ(Xy)(Omega)。发现法拉第旋转角(类似于类似于Mrad的精细结构常数)明显偏离了类Drude行为，在朗道能级填充nu=2附近呈现出类平板结构。这一结果与交流区载流子局域效应的预期行为相吻合，表明尽管未量子化，但在太赫兹区仍存在平台结构。
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 (similar to fine-structure constant similar to mrad) is found to significantly deviate from the Drude-like behavior to exhibit a plateaulike 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.