Imaging interedge-state scattering centers in the quantum Hall regime
Imaging interedge-state scattering centers in the quantum Hall regime
复制标题
量子霍尔体系中边缘态散射中心的成像
DOI：
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
A. Gossard
中科院分区：
文献类型：
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作者：
M. Woodside;C. Vale;P. McEuen;C. Kadow;K. Maranowski;A. Gossard
经过多年的研究和两次诺贝尔奖，量子霍尔效应继续为实验家和理论家提供重要的挑战。许多最有趣的问题都与二维电子气体（2g）中的非均匀空间结构有关！在强磁场中。这些结构产生于朗道水平之间的竞争效应~LL！量子化、库仑相互作用和外部电位，包括体2中的条纹相1和绝缘相以及定域于样品边缘的导电态~边缘态！扫描探针技术为直接研究这些结构提供了新的途径。它们最近被用于探测霍尔电压分布和量子霍尔平台内绝缘状态的特性。5‐9在这里，我们使用扫描探针通过检查量子霍尔导体中边缘态之间散射的性质来研究2DEG中空间结构对电子输运的微观影响。整数量子霍尔体系中的输运现在可以很好地理解为通过两个准一维边缘的输运
After years of study and two Nobel prizes, the quantum Hall effect continues to provide important challenges to both experimentalists and theorists. Many of the most interesting questions concern the nonuniform spatial structures that can occur within a two-dimensional electron gas ~2DEG! in high magnetic fields. These structures arise from competition between the effects of Landau level ~LL! quantization, Coulomb interactions, and external potentials and include striped phases 1 and insulating phases in the bulk 2 as well as conducting states localized at the edges of the sample ~edge states!. 3,4 Scanned probe techniques offer a new approach to investigate these structures directly. They have recently been used to probe the Hall voltage profile and the properties of the insulating state within a quantum Hall plateau. 5‐9 Here we use a scanned probe to investigate the microscopic effects of the spatial structure in a 2DEG on electron transport by examining the nature of the scattering between edge states in a quantum Hall conductor. Transport in the integer quantum Hall regime is now well understood in terms of transport through both quasi-1D edge