| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Topological edge state coupled mode-induced tetra-band tunable spin-dependent perfect absorption |
| Ji-Peng Wu(伍计鹏)1, Xi-Rui Zeng(曾玺瑞)1, Yu-Lei Liao(廖煜磊)1, Rong-Zhou Zeng(曾荣周)1, Hong Wen(文鸿)2, Xiao-Yu Dai(戴小玉)3, and Yuan-Jiang Xiang(项元江)3,† |
1 School of Transportation and Electrical Engineering, Hunan University of Technology, Zhuzhou 412007, China;
2 School of Aerospace, Hunan University of Technology, Zhuzhou 412007, China;
3 College of Electrical and Electronic Engineering, Wenzhou University, Wenzhou 325935, China |
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Abstract When discussing the spin-dependent optical perfect absorption (PA) phenomenon in a micro-nano structure, the designed structure should contain symmetry-breaking compositions that generally require an applied magnetic field. Fortunately, the multi-Weyl semimetal (mWSM) with natural time-reversal symmetry breaking property provides feasible schemes to investigate the spin-dependent PA without an external magnetic field. Recently, most existing schemes are primarily restricted to single- or dual-band spin-dependent PA in mWSM-based systems. Here, we present a heterostructure comprising five one-dimensional photonic crystals (PCs) and four identical mWSM layers to discuss the tetra-band spin-dependent PA. Results show that, due to the topological edge state-coupled mode and the nonzero off-diagonal term of mWSM, the PA of left-hand circularly polarized and right-hand circularly polarized light is attained at four distinct frequencies, respectively. More importantly, the tetra-band spin-dependent PA phenomenon can be regulated effectively via the tilt degree of Weyl cones, Fermi energy, topological charge, Weyl nodes separation, mWSM thickness, and the periods of the middle three PCs. This study provides an efficient scheme to achieve tetra-band adjustable spin-dependent PA without an external magnetic field, which may have potential applications in spin-dependent photonic devices.
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Received: 24 July 2025
Revised: 18 August 2025
Accepted manuscript online: 29 August 2025
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PACS:
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78.20.Ci
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(Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity))
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78.40.-q
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(Absorption and reflection spectra: visible and ultraviolet)
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78.20.Ls
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(Magneto-optical effects)
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78.67.Pt
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(Multilayers; superlattices; photonic structures; metamaterials)
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| Fund: This project is supported by the Education Department of Hunan Province (Grant Nos. 23B0571 and 24C0266), the Natural Science Foundation of Hunan Province (Grant No. 2023JJ40265), and the National Natural Science Foundation of China (Grant No. 12374302). |
Corresponding Authors:
Yuan-Jiang Xiang
E-mail: xiangyuanjiang@126.com
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Cite this article:
Ji-Peng Wu(伍计鹏), Xi-Rui Zeng(曾玺瑞), Yu-Lei Liao(廖煜磊), Rong-Zhou Zeng(曾荣周), Hong Wen(文鸿), Xiao-Yu Dai(戴小玉), and Yuan-Jiang Xiang(项元江) Topological edge state coupled mode-induced tetra-band tunable spin-dependent perfect absorption 2026 Chin. Phys. B 35 047801
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