  The effect of changing the temperature on the propagation of electromagnetic
surface waves (ESWs), guided by the planar interface of a homogeneous isotropic
temperature-sensitive material (namely, InSb) and a temperature-insensitive
structurally chiral material (SCM) was numerically investigated in the
terahertz frequency regime. As the temperature rises, InSb transforms from a
dissipative dielectric material to a dissipative plasmonic material.
Correspondingly, the ESWs transmute from Dyakonov-Tamm surface waves into
surface-plasmon-polariton waves. The effects of the temperature change are
clearly observed in the phase speeds, propagation distances, angular existence
domains, multiplicity, and spatial profiles of energy flow of the ESWs.
Remarkably large propagation distances can be achieved; in such instances the
energy of an ESW is confined almost entirely within the SCM. For certain
propagation directions, simultaneous excitation of two ESWs with (i) the same
phase speeds but different propagation distances or (ii) the same propagation
distances but different phase speeds are also indicated by our results.
