Nonequilibrium magnetotransport through a quantum dot: An interpolative   perturbative approach
  We study the differential conductance, spectral density and magnetization, for a quantum dot coupled to two conducting leads as a function of bias voltage, magnetic field and temperature. The system is modeled with the Anderson model solved using a spin dependent interpolative perturbative approximation in the Coulomb repulsion U that conserves the current. For large enough magnetic field, the differential conductance as a function of bias voltage shows split peaks. This splitting is larger than the corresponding splitting in the spectral density of states, in agreement with experiment. 
A.A. Aligia (Centro Atomico Bariloche, Argentina)