Nonreciprocal photonic spin hall effect in a bulk Dirac semimetal based tribonacci photonic crystal

Nonreciprocal photonic spin Hall effect manifests it as the different spin dependent reflected/transmitted transverse splittings of linearly polarized incident waves at two opposite wave propagation directions. However, its realization remains obscure. Here, we report the discovery of the prominent nonreciprocal photonic spin Hall effect in a bulk Dirac semimetal based on quasiperiodic Tribonacci photonic crystal, which is evidenced by the significantly large reflected spin shift along one propagation direction but the trivial spin shift along the opposite propagation direction due to its asymmetrical geometrical structure and electromagnetic field distribution. In addition, the Fermi energy of the bulk Dirac semimetal can be continuously modified by the external stimulus, which enables the effective control of the nonreciprocal photonic spin Hall effect in the Dirac semimetal based Tribonacci photonic crystal. Our results open up the alternative platform to generate the controllably nonreciprocal photonic spin Hall effect in the quasiperiodic systems via the combination of the bulk Dirac semimetals and Tribonacci photonic crystal.