  In a recent article, Chiang and Hsu [The Journal of Chemical Physics 153,
044103 (2020)] examine one and two site electronic junctions identically
connected to finite reservoirs. For these two examples, they derive analytical
solutions, as well as provide asymptotic analyses, for the steady-state current
from the driven Liouville-von Neumann (DLvN) equation - an open system approach
to transport in non-interacting systems where relaxation maintains a bias. The
two site junction they examine has destructive interference, which they show
leads to slow convergence of the DLvN to the Landauer limit with respect to
reservoir size and relaxation. We previously derived the general solution for
the steady-state current in both the DLvN and its many-body analog [Gruss et
al., Scientific Reports 6, 24514 (2016)]. The many-body analog is a Lindblad
master equation, which, when restricted to non-interacting systems, is exactly
the DLvN. Here, we demonstrate that applying the more general expression to
identical left and right reservoirs (i.e., finite reservoirs with the same
density of states and coupling to the system) and Markovian relaxation provides
a simple analytic form that applies to arbitrary, but identically connected,
junctions. Moreover, we briefly discuss the convergence of the current to the
Landauer and Meir-Wingreen result for non-interacting and interacting systems,
respectively. Convergence occurs as the reservoirs' lesser Green's functions
begin conforming to the fluctuation-dissipation theorem. Our approach sheds
light on the behavior Chiang and Hsu observe for destructive interference.
Finally, we show that the analytical results yield the asymptotic formulas
derived in Gruss et al.
