Integrable Impurities as Boundary Conditions

Understand

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.