Inelastic cotunneling through a long diffusive wire

We show that electron transport through a long multichannel wire, connected to leads by tunnel junctions, at low temperatures $T$ and voltages $V$ is dominated by inelastic cotunnelling. This mechanism results in experimentally observed power-law dependence of conductance on $T$ and $V$, in the diffusive regime where usual Coulomb anomaly theory leads to exponentially low conductance. The power-law exponent $\alpha^*$ is proportional to the distance between contacts $L$.