Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2002-02-20
Phys. Rev. B 66, 195328 (2002)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
14 pages, 8 figures
Scientific paper
10.1103/PhysRevB.66.195328
We study the energy distribution function of quasiparticles in voltage biased mesoscopic wires in presence of magnetic impurities and applied magnetic field. The system is described by a Boltzmann equation where the collision integral is determined by coupling to spin 1/2 impurities. We derive an effective coupling to a dissipative spin system which is valid well above Kondo temperature in equilibrium or for sufficiently smeared distribution functions in non-equilibrium. For low magnetic field an enhancement of energy relaxation is found whereas for larger magnetic fields the energy relaxation decreases again meeting qualitatively the experimental findings by Anthore et al. (cond-mat/0109297). This gives a strong indication that magnetic impurities are in fact responsible for the enhanced energy relaxation in copper wires. The quantitative comparison, however, shows strong deviations for energy relaxation with small energy transfer whereas the large energy transfer regime is in agreement with our findings.
Altshuler Boris L.
Galperin Yu. M.
Goeppert Georg
Grabert Hermann
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