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arXiv 1205.0367cond-mat.mes-hallquant-ph
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整数量子霍尔系统中分数阶不可压缩条纹的成像

Imaging fractional incompressible stripes in integer quantum Hall systems

Nicola Paradiso, Stefan Heun, Stefano Roddaro, Lucia Sorba, Fabio Beltram, Giorgio Biasiol, L. N. Pfeiffer, K. W. West

摘要:

输运实验提供了相互矛盾的证据分数阶整数量子霍尔系统内的可能存在。事实上,整数边缘态有时表现为没有内部结构的整体对象,而其他实验清楚地强调了分数子结构的作用。最近开发的低温扫描探针技术今天提供了一个机会,比以往任何时候都更深入的调查,这种边缘系统的空间特征。在这里,我们使用扫描门显微镜,并证明分数的功能,明确观察到在每一个整数量子霍尔收缩研究。我们还提出了相应的填充因子1/3,2/5,3/5和2/3的分数不可压缩条纹的宽度的实验估计。我们的研究结果与边缘重建理论的预测。

英文摘要:

Transport experiments provide conflicting evidence on the possible existence of fractional order within integer quantum Hall systems. In fact integer edge states sometimes behave as monolithic objects with no inner structure, while other experiments clearly highlight the role of fractional substructures. Recently developed low-temperature scanning probe techniques offer today an opportunity for a deeper-than-ever investigation of spatial features of such edge systems. Here we use scanning gate microscopy and demonstrate that fractional features were unambiguously observed in every integer quantum Hall constriction studied. We present also an experimental estimate of the width of the fractional incompressible stripes corresponding to filling factors 1/3, 2/5, 3/5, and 2/3. Our results compare well with predictions of the edge-reconstruction theory.

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