Inelastic cotunneling through a long diffusive wire
M. V. Feigel'man, A. S. Ioselevich
L.D. Landau Institute for Theoretical Physics RAS, 119334 Moscow, Russia
Moscow Institute of Physics and Technology, 141700 Moscow, Russia
PACS: 73.23.Hk, 73.63.-b
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 α* is proportional to the distance
between contacts L.