Shot noise reduction in quantum wires with the 0.7 structure

Shot noise reduction in quantum wires is interpreted within the model for the 0.7 structure in the conductance of near perfect quantum wires [T. Rejec, A. Ram\ifmmode \check{s}\else \v{s}\fi{}ak, and J. H. Jefferson, Phys. Rev. B 62, 12985 (2000)]. It is shown how the Fano factor structure is related to the specific structure of the conductance as a consequence of the singlet-triplet nature of the resonances with the probability ratio $1:3$. An additional feature in the Fano factor, related to the 0.25 structure in conductance, is predicted.