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Spin Effects of Low-dimensional Electron Gases Studied by Far-infrared Photoconductivity Experiments

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Abstract

We review our recent work on spin effects in low-dimensional electron gases studied using far-infrared photoconductivity technique. We measure the spin-orbit coupling parameter oc via spectroscopy by detecting the combined resonance. Detailed filling-factor dependent study shows the collective nature of this excitation, in accordance to theoretical predictions that both Kohn and Larmor theorem are broken for long-wavelength excitations that changes both the Landau and spin quantum numbers. We find that the long spin-relaxation time of a two-dimensional electron gas results in a novel bolometric spin effect, which gives rise to a substantial photo resistance change by reversing the spin polarization of electrons at the Fermi-level.

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Acknowledgments

This invited contribution has been based on collaborative studies which I unfortunately unable to present at the MRS 2004 spring meeting in San Francisco due to the “meandering long” visa process. I want to thank C. Zehnder, A. Wirthmann, K. Bittkau, Ch. Menk, Ch. Heyn, D. Heitmann and Y.S. Gui for their valuable contributions. I also wish to acknowledge financial supports by the EU 6th-Framework Programme through project BMR, the NEDO international spintronics project, the DFG through SFB 508 and BMBF through project 01BM905.

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  1. Institut für Angewandte Physik und Zentrum für Mikrostrukturforschung, Universität Hamburg, Jungiusstraße 11, D-20355, Hamburg, Germany

    C.-M. Hu

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  1. C.-M. Hu
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Hu, CM. Spin Effects of Low-dimensional Electron Gases Studied by Far-infrared Photoconductivity Experiments. MRS Online Proceedings Library 825, 44 (2004). https://doi.org/10.1557/PROC-825-G4.4

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