
VOLUME 86  ISSUE 10 
PAGE 762

Infrared catastrophe in twoquasiparticle collision integral 
O. V. Dimitrova^{+*}, V. E. Kravtsov^{+*}
^{+}L.D. Landau Institute for Theoretical Physics RAS, 117940 Moscow, Russia ^{*}The Abdus Salam International Centre for Theoretical Physics, P.O.B. 586, 34100 Trieste, Italy

PACS: 71.23.An, 72.15.Rn, 72.25.Ba, 73.63.Nm

Abstract
Relaxation of a nonequilibrium state in a disordered
metal with a spindependent electron energy distribution is
considered. The collision integral due to the electronelectron
interaction is computed within the approximation of a
twoquasiparticle scattering. We show that the spinflip
scattering processes with a small energy transfer may lead to the
divergence of the collision integral for a quasi onedimensional
wire. This divergence is present only for a spindependent
electron energy distribution which corresponds to the total
electron spin magnetization and only for nonzero
interaction in the triplet channel. In this case a
nonperturbative treatment of the electronelectron interaction is
needed to provide an effective infrared cutoff.


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