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Boulat, Saleur and Schmitteckert (BSS) reported results on the full $I-V$characteristics of the interacting resonant level model (IRLM) exhibitingregion with unexpected negative differential conductance (NDC). Usingtime-dependent density matrix renormalization group complemented with the exactsolution performed at a special point (the self-dual point) in the parameterspace BSS have shown that at nonzero Coulomb interaction $U$ the currentflowing through the impurity level (IL) exhibits a power-law asymptotics as afunction of large applied bias voltage. Similar conclusion was earlier reachedby Doyon. Even though their results are solid and supported by both analyticand numeric arguments, BSS concluded that "the NDC at large voltage seems atruly nonperturbative behavior, with unclear physical origin". On the contrary,the remarkable physics of NDC can be explained by simple physical argumentsand, as we shall show in this Comment, in certain circumstances can becalculated in the framework of perturbation theory.

Comment on "Twofold Advance in the Theoretical Understanding of Far-From-Equilibrium Properties of Interacting Nanostructures"