Two-dimensional metal-insulator transition in smooth random magnetic fields

Author： Sheng D. N.   Weng Z. Y.  

Publisher： Edp Sciences

E-ISSN： 1286-4854|50|6|776-781

ISSN： 0295-5075

Source： EPL (EUROPHYSICS LETTERS), Vol.50, Iss.6, 2010-03, pp. : 776-781

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Abstract

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 conductanceis found non-universal with a value around $e^2/h$. 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.

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