The nonequilibrium Kondo model: Crossover from weak to strong coupling

Details The nonequilibrium Kondo model: Crossover from weak to strong coupling The nonequilibrium Kondo model: Crossover from weak to strong coupling

2012-01-30

arxiv.org/abs/1201.6295v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages (paper) + 12 pages (supplementary material)

Scientific paper

We analyze the nonequilibrium Kondo model at finite voltage and temperature by using a new formulation of real-time renormalization group with the Laplace variable as flow parameter. We evaluate the energy-dependent spin relaxation rate and nonlinear conductance, and propose a universal line shape for the latter in the whole crossover regime from weak to strong coupling. The results are shown to agree well with exact methods in equilibrium, Fermi liquid theory, weak-coupling expansions, and recent experiments. For the spin relaxation dynamics we find a universal exponential decay in the long-time limit along with a truncation-dependent pre-exponential power-law. For multi-channel models a pure power-law decay typical for non-Fermi liquid behaviour is predicted.

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