Physics – Condensed Matter – Disordered Systems and Neural Networks
Scientific paper
2004-04-24
Phys. Rev. B 71, 245109 (2005)
Physics
Condensed Matter
Disordered Systems and Neural Networks
7 pages, 3 figures
Scientific paper
10.1103/PhysRevB.71.245109
We generalize Dykhne's calculation of the effective resistance of a 2D two-component medium to the case of frictional drag between the two parallel two-component layers. The resulting exact expression for the effective transresistance, $\rho^D_{eff}$, is analyzed in the limits when the resistances and transresistances of the constituting components are strongly different - situation generic for the vicinity of the {\em classical} (percolative) metal-insulator transition (MIT). On the basis of this analysis we conclude that the evolution of $\rho^D_{eff}$ across the MIT is determined by the type of correlation between the components, constituting the 2D layers. Depending on this correlation, in the case of two electron layers, $\rho^D_{eff}$ changes either monotonically or exhibits a sharp maximum. For electron-hole layers $\rho^D_{eff}$ is negative and $|\rho^D_{eff}|$ exhibits a sharp minimum at the MIT.
Apalkov Vadim M.
Raikh Mikhail E.
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