Two-dimensional metal-insulator transition in smooth random magnetic fields
Texas Center for Superconductivity, University of Houston Houston, TX 77204-5506, USA
Accepted: 14 April 2000
We re-examine the delocalization problem of two-dimensional electrons in the presence of random magnetic fields. By introducing short-range spatial correlations among random fluxes, a well-defined metal-insulator transition characterized by a two-branch scaling of conductance has been demonstrated numerically. Critical conductance is found non-universal with a value around . Interesting connections of this system with the recently observed B=0 two-dimensional metallic phase (Kravchenko et al., Phys. Rev. B, 50 (1994) 8039) are also discussed.
PACS: 71.30.+h – Metal-insulator transitions and other electronic transitions / 73.20.Fz – Weak or Anderson localization / 73.20.Jc – Delocalization processes
© EDP Sciences, 2000