Abstract
We study transport in a smooth random magnetic field, with emphasis on composite fermions (CFs) near half-filling of the Landau level. When either the amplitude of the magnetic field fluctuations or its mean value is large enough, the transport is percolating in nature. While at the percolation enhances the conductivity , increasing leads to a sharp falloff of and, consequently, to the quantum localization of CFs. We show that the localization is a crucial factor in the interplay between the Shubnikov–de Haas and quantum Hall oscillations and that the latter are dominant in the CF metal.
- Received 14 October 1997
DOI:https://doi.org/10.1103/PhysRevLett.80.2429
©1998 American Physical Society