Universal dephasing rate due to diluted Kondo impurities

Details Universal dephasing rate due to diluted Kondo impurities Universal dephasing rate due to diluted Kondo impurities

2005-09-22

arxiv.org/abs/cond-mat/0509583v3

Phys. Rev. Lett. 96, 226601 (2006)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 figures; minor modifications, version accepted by PRL

Scientific paper

10.1103/PhysRevLett.96.226601

We calculate the dephasing rate due to magnetic impurities in a weakly disordered metal as measured in a weak localization experiment. If the density n_S of magnetic impurities is sufficiently low, the dephasing rate 1/tau_phi is a universal function, 1/tau_phi = (n_S/nu) f(T/T_K), where T_K is the Kondo temperature and nu the density of states. We show that inelastic vertex corrections with a typical energy transfer Delta E are suppressed by powers of 1/(tau_phi Delta E) proportional to n_S. Therefore the dephasing rate can be calculated from the inelastic cross section proportional to pi nu Im T- |pi nu T|^2, where T is the T-matrix which is evaluated numerically exactly using the numerical renormalization group.

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