Coexistence of topological type-II Weyl and triply degenerate points in a chiral photonic metamaterial

Li, Mingzhu; Song, Jie; Jiang, Yongyuan

doi:10.1103/physrevb.105.085304

Cited by 11 publications

(4 citation statements)

References 60 publications

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“…In contrast to the Weyl point with a pointlike Fermi surface and a vanishing density of states, Weyl point can also be associated with a strongly tilted cone dispersion that breaks the Lorentz invariance, i.e., the so-called type-II Weyl point, in which the Fermi surface consists of touched electron-hole pockets with nonvanishing density of states [289]. Type-II Weyl points have been demonstrated in different photonic systems, such as, photonic crystals [285,290], waveguide arrays [288,291] and chiral metamaterials [280,286,292]. Apart from the Weyl points carrying a charge of ±1, Weyl points could also carry an arbitrary integer charge n, described by the following 3D Hamiltonian [293],…”

Section: Topological Photonics In 3dmentioning

confidence: 99%

A brief review of topological photonics in one, two, and three dimensions

Lan,

Chen,

Gao

et al. 2022

Preprint

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FIG. 2. 1D photonic SSH systems and their applications. (a) Near-field imaging of topological edge states in plasmonic nanochains. Reproduced with permission from [51], Copyright (2021), under CC BY-NC-ND. (b) Lasing at the topological edge states in a photonic crystal nanocavity dimer array. Reproduced with permission from [57], Copyright (2019), under CC BY 4.0. (c) Selective enhancement of interface states in a dielectric resonator chain. Reproduced with permission from [60], Copyright (2015), under CC BY 4.0. (d) Periodically bended ultrathin metallic waveguides for the observation of anomalous π modes via photonic floquet engineering. Reproduced with permission from [66], Copyright (2019) by the American Physical Society. (e) Protection of biphoton entanglement in an array of silicon nanowires. Reproduced with permission from [68], Copyright (2018) by the American Association for the Advancement of Science. (f) Photonic topological baths for quantum simulation. Reproduced with permission from [70], Copyright (2022) by the American Chemical Society. (g) Two coupled topological interfaces in waveguide arrays. Reproduced with permission from [72], Copyright (2020) by the American Chemical Society. (h) Selective excitation of topological edge states controlled by the handedness of incident light. Reproduced with permission from [76], Copyright (2016) by John Wiley and Sons.

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Section: Topological Photonics In 3dmentioning

confidence: 99%

A brief review of topological photonics in one, two, and three dimensions

Lan,

Chen,

Gao

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

“…It is an expansion of topological physics originating from solid-state physics [1][2][3][4][5]. Till now, topological photonics has achieved significant milestones, including the theoretical prediction and the experimental realization of photonic topological insulators [6][7][8], Dirac semimetals [9][10][11], Weyl semimetals [12][13][14][15][16], and so on. In recent years, the studied three-dimensional Weyl semimetals have attracted lots of attention in physics and material communities.…”

Section: Introductionmentioning

confidence: 99%

Fermi arc surface state and topological switch in the gyromagnetic metamaterials

Li¹,

Han

et al. 2023

New J. Phys.

Self Cite

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A landmark feature of the Weyl system is that it possesses the Fermi arc surface states. In this work, we demonstrate that the Fermi arc surface states connect the vacuum state and the Weyl points of gyromagnetic metamaterials (GMs). The nonzero Chern numbers and Berry phases show the nontrivial topological property of the GMs in momentum space. Full-wave simulations demonstrate that the chiral surface waves on the boundary between the GMs and vacuum state can achieve robustness against sharp corners of step-type configurations. Remarkably, the topological switch can be realized by adopting the Fermi arc surface states between two different GMs. We theoretically prove that the physical mechanism of realizing topological switch is caused by different gap Chern numbers of the material system. Moreover, the direction of the topological switch can be operated by manipulating the gyromagnetic parameters of the GMs in the “button” region. Our work may provide more flexibility for the flexible and robust topological devices.

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“…The topological semimetals are gapless in bulk structures, and their nontrivial topological properties are characterized by band degeneracy [20]. The development of topological semimetals reveals fascinating phenomena such as Dirac degeneracies [21][22][23][24], triple degenerate points [25][26][27][28], Weyl points [29][30][31][32][33][34][35][36][37], and nodal line (surface) [38][39][40]. Particularly, the Weyl point is regarded as a chiral singularity in three-dimensional momentum space [36].…”

Section: Introductionmentioning

confidence: 99%

Topological phase transitions and Weyl semimetal phases in chiral photonic metamaterials

et al. 2022

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Recently, topologically nontrivial phases in chiral metamaterials have been proposed. However, a comprehensive description of topological phase diagrams and transitions in chiral metamaterials has not been presented. In this work, we demonstrate several forms of topological phase transitions and study the existence of edge states in different phases. In the local/lossless chiral media system, the topological phase transitions are associated with the Weyl points. Along with the transitions, the edge state and Fermi arc exhibit a series of changes. When nonlocal effect is introduced, the system shows phase change between type-I/II Weyl semimetal phase and trivial phase. Moreover, the dissipative system also undergoes topological phase transitions owing to the annihilation of the topological charges. Our work could be helpful for the application of topological concepts and rich the topological wave physics in metamaterial.

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Coexistence of topological type-II Weyl and triply degenerate points in a chiral photonic metamaterial

Cited by 11 publications

References 60 publications

A brief review of topological photonics in one, two, and three dimensions

A brief review of topological photonics in one, two, and three dimensions

Fermi arc surface state and topological switch in the gyromagnetic metamaterials

Topological phase transitions and Weyl semimetal phases in chiral photonic metamaterials

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