  The enhanced photonic spin hall effect (PSHE) plays a positive role in the
flexible manipulation of photons. Here, by combining Dirac semimetals with
Bragg reflector constructed by one-dimensional photonic crystal, we
theoretically design a simple multilayer structure to enhance and manipulate
the PSHE. Through the detailed and optimal design of the conductivity
characteristics of Dirac semimetals and the structural parameters of the whole
model, we realize the excitation of Optical Tamm states (OTSs) in the
multilayer structure, so that the PSHE can be enhanced and controllable. The
theoretical results show that by optimizing the Fermi energy and the thickness
of Dirac semimetal, the reflection coefficient ratio can be increased under
p-polarization and s-polarization, thus creating conditions for enhanced PSHE.
In addition, the effects of the incident angle and the parameters of the spacer
layer on the PSHE are also clarified. We believe above results can provide a
new paradigm for the construction of controllable spin devices.
