  Nonequilibrium quantum transport is of central importance in nanotechnology.
Its description requires the understanding of strong electronic correlations,
which couple atomic-scale phenomena to the nanoscale. So far, research in
correlated transport focused predominantly on few-channel transport, precluding
the investigation of cross-scale effects. Recent theoretical advances enable
the solution of models that capture the interplay between quantum correlations
and confinement beyond a few channels. This problem is the focus of this study.
We consider an atomic impurity embedded in a metallic nanosheet spanning two
leads, showing that transport is significantly altered by tuning only the phase
of a single, local hopping parameter. Furthermore -- depending on this phase --
correlations reshape the electronic flow throughout the sheet, either funneling
it through the impurity or scattering it away from a much larger region. This
demonstrates the potential for quantum correlations to bridge length scales in
the design of nanoelectronic devices and sensors.
