  We predict a novel quantum interference based on the negative refraction
across a semiconductor P-N junction: with a local pump on one side of the
junction, the response of a local probe on the other side behaves as if the
disturbance emanates not from the pump but instead from its mirror image about
the junction. This phenomenon is guaranteed by translational invariance of the
system and matching of Fermi surfaces of the constituent materials, thus it is
robust against other details of the junction (e.g., junction width, potential
profile, and even disorder). The recently fabricated P-N junctions in 2D
semiconductors provide ideal platforms to explore this phenomenon and its
applications to dramatically enhance charge and spin transport as well as
carrier-mediated long-range correlation.

Materials Science