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The enhanced photonic spin hall effect (PSHE) plays a positive role in theflexible manipulation of photons. Here, by combining Dirac semimetals withBragg reflector constructed by one-dimensional photonic crystal, wetheoretically design a simple multilayer structure to enhance and manipulatethe PSHE. Through the detailed and optimal design of the conductivitycharacteristics of Dirac semimetals and the structural parameters of the wholemodel, we realize the excitation of Optical Tamm states (OTSs) in themultilayer structure, so that the PSHE can be enhanced and controllable. Thetheoretical results show that by optimizing the Fermi energy and the thicknessof Dirac semimetal, the reflection coefficient ratio can be increased underp-polarization and s-polarization, thus creating conditions for enhanced PSHE.In addition, the effects of the incident angle and the parameters of the spacerlayer on the PSHE are also clarified. We believe above results can provide anew paradigm for the construction of controllable spin devices.

Enhanced spin hall effect of reflected light due to Optical Tamm states with Dirac semimetal at the terahertz range