Photonic topological insulators
Alexander B. Khanikaev,S. Hossein Mousavi,Wang-Kong Tse,Mehdi Kargarian,Allan H. MacDonald,Gennady Shvets +5 more
TLDR
It is shown that metacrystals-superlattices of metamaterials with judiciously designed properties-provide a platform for designing topologically non-trivial photonic states, similar to those identified for condensed-matter topological insulators.Abstract:
Recent progress in understanding the topological properties of condensed matter has led to the discovery of time-reversal-invariant topological insulators. A remarkable and useful property of these materials is that they support unidirectional spin-polarized propagation at their surfaces. Unfortunately topological insulators are rare among solid-state materials. Using suitably designed electromagnetic media (metamaterials) we theoretically demonstrate a photonic analogue of a topological insulator. We show that metacrystals-superlattices of metamaterials with judiciously designed properties-provide a platform for designing topologically non-trivial photonic states, similar to those that have been identified for condensed-matter topological insulators. The interfaces of the metacrystals support helical edge states that exhibit spin-polarized one-way propagation of photons, robust against disorder. Our results demonstrate the possibility of attaining one-way photon transport without application of external magnetic fields or breaking of time-reversal symmetry. Such spin-polarized one-way transport enables exotic spin-cloaked photon sources that do not obscure each other.read more
Citations
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Topological LC-circuits based on microstrips and observation of electromagnetic modes with orbital angular momentum
TL;DR: It is demonstrated directly that topological interfacial electromagnetic waves launched by a linearly polarized dipole source propagate in opposite directions according to the sign of the orbital angular momentum.
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Topological all-optical logic gates based on two-dimensional photonic crystals
Lu He,Weixuan Zhang,X. D. Zhang +2 more
TL;DR: This work reports the design of topological filter and all-optical logic gates based on two-dimensional photonic crystals with robust edge states and shows that such robust and compact logic devices have potential applications in future photonic integrated circuits.
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Topological phonons and thermoelectricity in triple-point metals
Sobhit Singh,QuanSheng Wu,QuanSheng Wu,Changming Yue,Alessandra Romero,Alexey A. Soluyanov,Alexey A. Soluyanov +6 more
TL;DR: In this paper, the authors provided theoretical and numerical evidence that the points in the phonon spectrum at which three (two optical and one acoustic) phonon modes (bands) cross represent a well-defined topological material phase, in which the hosting metals have very strong thermoelectric response.
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Topological Edge Modeling and Localization of Protected Interface Modes in 1D Phononic Crystals for Longitudinal and Bending Elastic Waves
Muhammad,Weijian Zhou,C.W. Lim +2 more
TL;DR: In this article, a theoretical and numerical study on the band transition and topological interface modes with topological phases is established for a 1D periodic cross-sections of phononic crystals (PCs) consisting of circular aluminum beams.
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Reducing the Dispersion of Periodic Structures with Twist and Polar Glide Symmetries.
TL;DR: The dispersion analysis shows that a mode in a structure possessing higher symmetries is less dispersive than in a conventional structure, and it is demonstrated that, similar to the previously studied Cartesian glide-symmetric structures, polar glide-Symmetric structure also exhibit a frequency independent response.
References
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Xiao-Liang Qi,Shou-Cheng Zhang +1 more
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Negative Refraction Makes a Perfect Lens
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The Electrodynamics of Substances with Simultaneously Negative Values of ∊ and μ
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Experimental Verification of a Negative Index of Refraction
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