Photonic spin Hall effect in symmetrical structure containing Dirac semimetal materials

Song, Qiong; Da, Haixia; Yan, Hong Xiao

doi:10.1088/1361-6463/ac7e08

Cited by 3 publications

(1 citation statement)

References 34 publications

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“…For example, Yin et al discussed the enhanced PSHE in a Bragg reflector consisting of 3DDS, a space layer, and a onedimensional photonic crystal, which was caused by the excitation of the optical Tamm states [22]. Song et al proposed a symmetrical structure containing 3DDS and found that this structure also supports the enhanced PSHE because of the excitation of the surface plasmon resonance in the 3DDS material [23]. In addition, both of the magnitudes of their spin shifts can be controlled by the Fermi energy of 3DDS.…”

Section: Introductionmentioning

confidence: 99%

Giant and tunable photonic spin Hall effect in a parity-time symmetric structure with a Dirac semimetal material

Qi,

Da,

Yan

2024

Phys. Scr.

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The optical parity-time (PT) symmetry structure can yield unique properties, including periodicity, discreteness, nonlinearity, and so on. However, the component materials in these PT symmetry structures have been primarily restricted by their lack of tunability. Here, by utilizing the external stimulus-dependent optical properties of the Dirac semimetal, we report the theoretical prediction of the large and controllable photonic spin Hall effect in the PT symmetry structure with the slab of the Dirac semimetal. We provide evidence that the PT symmetry structure with the Dirac semimetal exhibits a large spin shift as high as the half of the waist at a certain incident angle, which is the conventionally theoretical upper limit. Due to the combination of and , the spin shift can be enhanced effectively. Furthermore, we unravel that a small change in the Fermi energy of the Dirac semimetal on the order of 0.01 eV is able to engineer both the magnitude and sign of the spin shift. In particular, there is a transition in the spectrum of the spin shift when we vary the Fermi energy of the Dirac semimetal, where the number of the spin shift peak changes from one to two. Our results reveal the interplay between the light and the PT symmetry structure with the Dirac semimetal, which offers the possibility of developing Dirac semimetal-based spin-dependent photonic devices.

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Section: Introductionmentioning

confidence: 99%

Giant and tunable photonic spin Hall effect in a parity-time symmetric structure with a Dirac semimetal material

Qi,

Da,

Yan

2024

Phys. Scr.

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Topological edge state-induced enhancement of photonic spin Hall effect in a heterostructure with monolayer graphene

Song

Yan

2023

Journal of Applied Physics

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Photonic spin Hall effect (PSHE) of the transmitted wave presents promising applications in photonic spintronic devices, including inter-chip optical circuitry and quantum computing devices. These applications can benefit from phenomena such as the photon tunneling effect, frustrated total internal reflection, and the resonant optical tunneling effect. However, the mechanisms for enhancing PSHE of the transmitted wave are limited. In this study, an alternative strategy is proposed, which involves the utilization of topological edge states to enhance PSHE without relying on the aforementioned means. To demonstrate this effect, a heterostructure is designed, comprising two one-dimensional photonic crystals (PhCs) and a monolayer graphene. By leveraging the topological edge state, a significant enhancement of PSHE in the transmitted wave is observed, surpassing several times the incident wavelength. Furthermore, it is shown that the enhanced PSHE can be controlled and fine-tuned by adjusting the Fermi energy of monolayer graphene and the repetition numbers of the two PhCs. The enhanced and controlled PSHE in this heterostructure introduces possibilities for the development of novel optical components, such as switches, filters, modulators, and sensors.

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Giant and nonreciprocal photonic spin Hall effect in asymmetric multilayered structure with bulk Dirac semimetal

Liu,

Zhang,

Yin

et al. 2024

Phys. Scr.

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The nonreciprocal photonic spin Hall effect features the different reflected or transmitted spin shifts along two opposite incident wave propagating directions. However, previous investigations have always focused on the features of the photonic spin Hall effect along one incident wave propagating direction. How to achieve the nonreciprocal photonic spin Hall effect remains obscure. Here, we theoretically study the nonreciprocal photonic spin Hall effect in the asymmetric multilayered structure containing the Bulk Dirac Semimetal and other dielectric materials. It is found that under the horizontal polarization the maximum reflected spin shift value along one direction is up to around − 14.4 times of the incident wavelength at 70.88 ° , but it is only 0.46 times of the incident wavelength at 73.2 ° along the other direction, which reflects the nonreciprocity of photonic spin Hall effect and thus can act as the photonic spin Hall diode. Such a sizeable directional difference between the reflected spin shifts along these two opposite directions originates from the fact that this structure loses its mirror symmetry and becomes an asymmetrical one, and the obvious difference in the values of the reflected spin shifts along the two directions can be attributed to the large difference in the values of ∣ r s / r p ∣ . At the same time, we find that the Fermi energy of the Bulk Dirac Semimetal can effectively tune the spin shift along the backward direction, as well as the difference between the spin shifts for two different propagating directions, which causes the controllable nonreciprocal photonic spin Hall effect. Our results establish the alternative configuration for realizing the nonreciprocal photonic spin Hall effect, which facilitates the potential applications in the spin photonic devices.

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Photonic spin Hall effect in symmetrical structure containing Dirac semimetal materials

Cited by 3 publications

References 34 publications

Giant and tunable photonic spin Hall effect in a parity-time symmetric structure with a Dirac semimetal material

Giant and tunable photonic spin Hall effect in a parity-time symmetric structure with a Dirac semimetal material

Topological edge state-induced enhancement of photonic spin Hall effect in a heterostructure with monolayer graphene

Giant and nonreciprocal photonic spin Hall effect in asymmetric multilayered structure with bulk Dirac semimetal

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