Variable range cotunneling and conductivity of a granular metal
Mesoscale and Nanoscale Physics
2009-11-11 v1 Disordered Systems and Neural Networks
Abstract
The Efros-Shklovskii law for the conductivity of granular metals is interpreted as a result of a variable range cotunneling process. The cotunneling between distant resonant grains is predominantly elastic at low T << T_c, while it is inelastic (i.e., accompanied by creation of electron-hole pairs on a string of intermediate non-resonant grains) at T > T_c. The corresponding E-S temperature T_ES in the latter case is slightly (logarithmically) T-dependent. The magnetoresistance in the two cases is different: it may be relatively strong and negative at T much below T_c, while at T>T_c it is suppressed due to inelastic processes which destroy the interference.
Keywords
Cite
@article{arxiv.cond-mat/0502481,
title = {Variable range cotunneling and conductivity of a granular metal},
author = {M. V. Feigel'man and A. S. Ioselevich},
journal= {arXiv preprint arXiv:cond-mat/0502481},
year = {2009}
}
Comments
Submitted to JETP Letters