  In this work we study modifications of the spectrum of fermions interacting
with kinklike structures in two-dimensional spacetime. We consider the Yukawa
coupling between fermions and scalar fields that engender nontrivial internal
structure and investigate how the fermion spectra change in terms of the
parameters that control the kinklike configuration and the Yukawa coupling. We
consider models that allow the internal structure of the kinklike solution to
respond to the presence of a geometrical constriction, and show the fermion
spectra may also appear directly affected by the constriction. The main results
are of current interest and may be used to propose the construction of
electronic devices capable of engendering new effects at the nanometric scale.
