Quantum effects in the terahertz optical Hall conductivity at the cyclotron resonance of a two dimensional electron gas

Details Quantum effects in the terahertz optical Hall conductivity at the cyclotron resonance of a two dimensional electron gas Quantum effects in the terahertz optical Hall conductivity at the cyclotron resonance of a two dimensional electron gas

2011-12-30

arxiv.org/abs/1201.0182v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

18 pages, 3 figures

Scientific paper

We have investigated the optical Hall conductivity of a two-dimensional electron gas in the terahertz regime close to the cyclotron resonance (CR) frequency with a sensitive Faraday rotation polarization modulation technique. We find plateau- and step-like features in the Faraday rotation angle versus Landau-level filling in this field/frequency regime, which are outside the classical Drude picture. We attribute the observed effects to remnants of dc quantum Hall effect plateaus. The width of the measured plateau-like features in the Faraday rotation angle around integer filling factors is in good agreement with a dynamical scaling theory.

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