A few exactly solvable interacting quantum many-body problems with impurities
were previously reported to exhibit unusual features such as non-localization
and absence of backscattering. In this work we consider the use of these
integrable impurities as boundary conditions in the framework of linear
transport problems. We first show that such impurities enhance the density of
states at the Fermi surface, thus increasing the effective system size. The
study of the real time-dynamics of a wave packet sent through a series of them
inserted in both non-interacting and interacting leads then indicates that
these impurities are transparent and do not add artefacts to the measurement of
transport properties. We finally apply these new boundary conditions to study
the conductance of an interacting scatterer using the embedding method.Comment: 6 figure
