  Helical states can be measured through the observation of the reentrant
behaviour, which is a dip in the conductance probed in semiconducting nanowires
(NWs) with strong spin-orbit coupling (SOC) under the presence of an external
perpendicular magnetic field. We investigate the effects of deformations in the
electronic transport in NWs considering the coupling between different
transverse modes. Within this approach, we show that the dip in the conductance
of a NW is affected by the presence of a local constriction. Moreover, we find
that the reentrant feature in the conductance can appear in NWs with a local
expansion of its radius, even in the absence of SOC and magnetic field.
Furthermore, we develop a numerical approach to calculate transport properties,
which is able to include the deformation and the coupling among several
scattering channels.
