Steady-state currents through nanodevices: a scattering-states numerical renormalization-group approach to open quantum systems.
We propose a numerical renormalization group (NRG) approach to steady-state currents through nanodevices. A discretization of the scattering-states continuum ensures the correct boundary condition for an open quantum system. We introduce two degenerate Wilson chains for current carrying left- and right-moving electrons reflecting time-reversal symmetry in the absence of a finite bias V. We employ the time-dependent NRG to evolve the known steady-state density operator for a noninteracting junction into the density operator of the fully interacting nanodevice at finite bias. We calculate the differential conductance as function of V, T, and the external magnetic field.
Anders
Frithjof B
FB
Institut für Theoretische Physik, Universität Bremen, P.O. Box 330 440, D-28334 Bremen, Germany.