Non-equilibrium transport and relaxation dynamics in quantum dots

by Dirk Schuricht (RWTH Aachen)

Wednesday 16 Jan 2013, 16:00 → 17:00 Europe/Berlin

SR6 (DESY Hamburg)

We study the non-equilibrium transport through a single-orbital Anderson model with spin-dependent hopping amplitudes, which is, in the cotunneling regime, described by an effective spin-1/2 dot with a Dzyaloshinsky--Moriya--Kondo (DMK) interaction between the spin on the dot and the electron spins in the leads. We show that the DMK interaction is strongly renormalized at low energies and leads to a voltage-dependent field renormalization as well as voltage asymmetry in the differential conductance. In the second part we study the relaxation dynamics of Kondo-type quantum dots both due to the coupling to electronic leads as well as the hyperfine interaction of the Kondo spin to nuclear spins in the substrate.