  Weyl semimetals exhibit exotic transport responses, among which, recently
Goos-Haenchen (GH) and Imbert-Fedorov (IF) effects have received a revived
attention, which are, otherwise, well-studied phenomena in optical systems and
certain electronic systems. Besides the usual parametric dependence of the
shifts inherited from the underlying Hamiltonian to describe the Weyl system
and/or that induced by external controls, the IF shift further carries a
topological identity -- it depends on the chirality of the Weyl cones. A
realistic system of Weyl semimetal naturally accommodates surface potentials
induced by impurities present on its surface that could pose impediments to
observe clean transport signatures predicted in theoretical models. Classifying
these potentials, we study their effects on GH and IF shifts to provide useful
guidance to future experiments that are tuned to the objective of
characterizing Weyl semimetals and for a possible realisation of novel devices
based on these phenomena. A transfer matrix-based approach is invoked to study
the profile of Weyl wavefunctions across the interface which is hosting the
impurity potentials, revealing that such potentials can lead to several
discerning effects which, in certain cases, extend even to nullifying the IF
shift completely and giving rise to phenomenon like valley inversion.
