Braun Center for Submicron Research, Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot 76100, Israel.
Phys Rev Lett. 2009 Dec 4;103(23):236802. doi: 10.1103/PhysRevLett.103.236802. Epub 2009 Dec 2.
The exact structure of edge modes in "hole conjugate" fractional quantum Hall states remains an unsolved issue despite significant experimental and theoretical efforts devoted to their understanding. Recently, there has been a surge of interest in such studies led by the search for neutral modes, which in some cases may lead to exotic statistical properties of the excitations. In this Letter, we report on detailed measurements of shot noise, produced by partitioning of the more familiar 2/3 state. We find a fractional charge of (2/3)e at the lowest temperature, decreasing to e/3 at an elevated temperature. Surprisingly, strong shot noise had been measured on a clear 1/3 plateau upon partitioning the 2/3 state. This behavior suggests an uncommon picture of the composite edge channels quite different from the accepted one.
尽管在理解“孔共轭”分数量子霍尔态的边缘模式方面做出了重大的实验和理论努力，但它们的确切结构仍然是一个未解决的问题。最近，由于对中性模式的研究兴趣激增，这种研究有所增加，在某些情况下，这可能导致激发的奇特统计性质。在这封信中，我们报告了详细的测量结果，这些结果是通过对更为人熟悉的 2/3 态进行分区而产生的。我们发现，在最低温度下，噪声的分频数为(2/3)e，在较高温度下降至 e/3。令人惊讶的是，在对 2/3 态进行分区时，在清晰的 1/3 平台上已经测量到了很强的噪声。这种行为表明复合边缘通道的情况很不寻常，与公认的情况有很大不同。
