Abstract
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 state. We find a fractional charge of at the lowest temperature, decreasing to at an elevated temperature. Surprisingly, strong shot noise had been measured on a clear plateau upon partitioning the state. This behavior suggests an uncommon picture of the composite edge channels quite different from the accepted one.
- Received 9 July 2009
DOI:https://doi.org/10.1103/PhysRevLett.103.236802
©2009 American Physical Society