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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Type-II Dirac Photons at Metasurfaces.
Chuandeng Hu,Zhenyu Li,Zhenyu Li,Rui Tong,Xiaoxiao Wu,Zengzilu Xia,Li Wang,Shanshan Li,Shanshan Li,Yingzhou Huang,Shuxia Wang,Bo Hou,Bo Hou,Che Ting Chan,Weijia Wen,Weijia Wen +15 more
TL;DR: It is shown that metasurfaces are simple and practical platforms for realizing electromagnetic type-II Dirac points, and their planar structure is a distinct advantage that facilitates applications in two-dimensional topological photonics.
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Quasitopological rotational waves in mechanical granular graphene
TL;DR: In this article, the topological properties of rotational and coupled rotational-translational waves in a two-dimensional monolayer honeycomb granular crystal with Dirac dispersion at the center of the Brillouin zone were investigated.
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Surface-Enhanced Molecular Electron Energy Loss Spectroscopy.
Andrea Konečná,Tomáš Neuman,Javier Aizpurua,Javier Aizpurua,Rainer Hillenbrand,Rainer Hillenbrand +5 more
TL;DR: The interaction of a localized electron beam with molecule-covered polaritonic nanoantennas is theoretically described, and the concept of surface-enhanced molecular EELS exploiting the electromagnetic coupling between the nanoantenna and the molecular sample is proposed.
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Simultaneous topological Bragg and locally resonant edge modes of shear horizontal guided wave in one-dimensional structure
TL;DR: In this article, the topological edge modes of a shear horizontal (SH) guided wave in the one-dimensional (1D) composite structure that exist at the phononic band gaps opened at the center of the Brillouin zone (BZ), or at the zone boundary, or both were investigated.
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Anomalous Topological Edge States in Non-Hermitian Piezophononic Media.
TL;DR: This work numerically employs the acoustoelectric effect in electrically biased and layered piezophononic media as a solid framework for non-Hermitian and nonreciprocal topological mechanics in the MHz regime and discusses how in-gap edge states in the same instant, counterintuitively are able to delocalize along the entire layered medium.
References
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Colloquium: Topological insulators
M. Z. Hasan,Charles L. Kane +1 more
TL;DR: In this paper, the theoretical foundation for topological insulators and superconductors is reviewed and recent experiments are described in which the signatures of topologically insulators have been observed.
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Topological insulators and superconductors
Xiao-Liang Qi,Shou-Cheng Zhang +1 more
TL;DR: Topological superconductors are new states of quantum matter which cannot be adiabatically connected to conventional insulators and semiconductors and are characterized by a full insulating gap in the bulk and gapless edge or surface states which are protected by time reversal symmetry.
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Negative Refraction Makes a Perfect Lens
TL;DR: The authors' simulations show that a version of the lens operating at the frequency of visible light can be realized in the form of a thin slab of silver, which resolves objects only a few nanometers across.
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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
TL;DR: These experiments directly confirm the predictions of Maxwell's equations that n is given by the negative square root ofɛ·μ for the frequencies where both the permittivity and the permeability are negative.