  A recently proposed density functional approach for steady-state transport
through nanoscale systems (called i-DFT) is used to investigate junctions which
are asymmetrically coupled to the leads and biased with asymmetric voltage
drops. In the latter case, the system can simply be transformed to a physically
equivalent one with symmetric voltage drop by a total energy shift of the
entire system. For the former case, known exchange correlation gate and bias
functionals have to be generalized to take into account the asymmetric coupling
to the leads. We show how differential conductance spectra of the constant
interaction model evolve with increasing asymmetry of both voltage drops and
coupling to the leads.
