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A recently proposed density functional approach for steady-state transportthrough nanoscale systems (called i-DFT) is used to investigate junctions whichare asymmetrically coupled to the leads and biased with asymmetric voltagedrops. In the latter case, the system can simply be transformed to a physicallyequivalent one with symmetric voltage drop by a total energy shift of theentire system. For the former case, known exchange correlation gate and biasfunctionals have to be generalized to take into account the asymmetric couplingto the leads. We show how differential conductance spectra of the constantinteraction model evolve with increasing asymmetry of both voltage drops andcoupling to the leads.

Exchange-correlation functionals of i-DFT for asymmetrically coupled leads