Christoph B. M. Hörig, Dirk Schuricht, Sabine Andergassen
We study non-equilibrium transport through a spin-1 Kondo dot in a local
magnetic field. To this end we perform a two-loop renormalization group
analysis in the weak-coupling regime yielding analytic results for (i) the
renormalized magnetic field and the g-factor, (ii) the time evolution of
observables and the relevant decay rates, (iii) the magnetization and
anisotropy as well as (iv) the current and differential conductance in the
stationary state. In particular, we find that compared to a spin-1/2 Kondo dot
there exist three additional decay rates resulting in an enhanced broadening of
the logarithmic features observed in stationary quantities. Additionally, we
study the effect of anisotropic couplings between reservoir and impurity spin.
View original:
http://arxiv.org/abs/1110.6103
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