Tunneling and nonuniversality in continuum percolation systems

被引:123
作者
Grimaldi, C
Balberg, I
机构
[1] Ecole Polytech Fed Lausanne, LPM, CH-1015 Lausanne, Switzerland
[2] Univ Geneva, DPMC, CH-1211 Geneva 4, Switzerland
[3] Hebrew Univ Jerusalem, Racah Inst Phys, IL-91904 Jerusalem, Israel
关键词
D O I
10.1103/PhysRevLett.96.066602
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
The values obtained experimentally for the conductivity critical exponent in numerous percolation systems, in which the interparticle conduction is by tunneling, were found to be in the range of t(0) and about t(0)+10, where t(0) is the universal conductivity exponent. These latter values are, however, considerably smaller than those predicted by the available "one-dimensional"-like theory of tunneling percolation. In this Letter, we show that this long-standing discrepancy can be resolved by considering the more realistic "three-dimensional" model and the limited proximity to the percolation threshold in all the many available experimental studies.
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页数:4
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