  We investigate the influence of chirality on the PT-symmetric and PT-broken
phase of PT-symmetric chiral systems. Starting from the point that transverse
magnetic (TM) and transverse electric (TE) waves have different exceptional
points, we show that with circularly polarized waves (which are linear
combinations of TM and TE waves) mixed PT-symmetric phases can be realized and
the extent of these phases can be highly controlled by either or both the
chirality and the angle of incidence. Additionally, while the transmission of
both TM and TE waves in non-chiral PT-symmetric systems is the same for forward
and backward propagation, we show that with chirality this symmetry can be
broken. As a result, it is possible to realize asymmetric, i.e. side-dependent,
rotation and ellipticity in the polarization state of the transmitted wave. Our
results constitute a simple example of a chiral PT-symmetric optical system in
which the various phases (full PT, mixed, broken) and the asymmetric effects
can be easily tuned by adjusting the chirality parameter and/or the angle of
incidence.
