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首页> 外文期刊>Journal of Experimental and Theoretical Physics >Decoherence induced by magnetic impurities in a quantum hall system
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Decoherence induced by magnetic impurities in a quantum hall system

机译：量子霍尔系统中磁性杂质引起的退相干

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摘要

Scattering by magnetic impurities is known to destroy coherence of electron motion in metals and semiconductors. We investigate the decoherence introduced in a single act of electron scattering by a magnetic impurity in a quantum Hall system. For this, we introduce a fictitious nonunitary scattering matrix [InlineMediaObject not available: see fulltext.] for electrons that reproduces the exactly calculated scattering probabilities. The strength of decoherence is identified by the deviation of eigenvalues of the product [InlineMediaObject not available: see fulltext.] from unity. Using the fictitious scattering matrix, we estimate the width of the metallic region at the quantum Hall effect inter-plateau transition and its dependence on the exchange coupling strength and the degree of polarization of magnetic impurities.
机译：已知由磁性杂质引起的散射会破坏金属和半导体中电子运动的相干性。我们研究了由量子霍尔系统中的磁性杂质在单次电子散射行为中引入的退相干。为此，我们为电子引入了一个虚构的非scattering散散射矩阵[InlineMediaObject不可用：请参阅全文。]，该矩阵重现了精确计算的散射概率。去相干的强度通过乘积[InlineMediaObject不可用：请参见全文。使用虚拟散射矩阵，我们估计了量子霍尔效应跨平台跃迁处的金属区域的宽度及其对交换耦合强度和磁性杂质极化程度的依赖性。

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