Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2001-10-26
Phys. Rev. E 65, 036124 (2002)
Physics
Condensed Matter
Statistical Mechanics
21 pages, 5 figures, to appear in Phys. Rev. E
Scientific paper
10.1103/PhysRevE.65.036124
Focusing on multifractal properties we investigate electric transport on random resistor diode networks at the phase transition between the non-percolating and the directed percolating phase. Building on first principles such as symmetries and relevance we derive a field theoretic Hamiltonian. Based on this Hamiltonian we determine the multifractal moments of the current distribution that are governed by a family of critical exponents $\{\psi_l \}$. We calculate the family $\{\psi_l \}$ to two-loop order in a diagrammatic perturbation calculation augmented by renormalization group methods.
Janssen Hans-Karl
Stenull Olaf
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