期刊
PHYSICAL REVIEW A
卷 103, 期 5, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.103.053507
关键词
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资金
- RFBR [18-502-12080]
- DFG [18-502-12080]
- Deutsche Forschungsgemeinschaft [BL 574/13-1, SZ 276/19-1, SZ 276/20-1]
- Government of Spain (Severo Ochoa) [CEX2019-000910-S]
- Portuguese Foundation for Science and Technology (FCT) [UIDB/00618/2020]
- Fundacio Cellex
- Fundacio Mir-Puig
- Generalitat de Catalunya (CERCA)
A novel type of topological dipole soliton is theoretically introduced in a specific topological insulator structure, with bright envelopes of different symmetries. These solitons can exist under the unique spectral features of edge states in the structure.
We theoretically introduce a type of topological dipole soliton propagating in a Floquet topological insulator based on a kagome array of helical waveguides. Such solitons bifurcate from two edge states belonging to different topological gaps and have bright envelopes of different symmetries: fundamental for one component, and dipole for the other. The formation of dipole solitons is enabled by unique spectral features of the kagome array which allow the simultaneous coexistence of two topological edge states from different gaps at the same boundary. Notably, these states have equal and nearly vanishing group velocities as well as the same sign of the effective dispersion coefficients. We derive envelope equations describing the components of dipole solitons and demonstrate in full continuous simulations that such states indeed can survive over hundreds of helix periods without any noticeable radiation into the bulk.
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