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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Continuous bulk and interface description of topological insulators
TL;DR: In this article, the authors analyzed the topological properties of systems of Dirac equations in the presence of heterogeneities to model transport in topological insulators by means of indices of Fredholm operators.
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Observation of Three-Dimensional Photonic Dirac Points and Spin-Polarized Surface Arcs.
Qinghua Guo,Qinghua Guo,Oubo You,Oubo You,Biao Yang,Biao Yang,James B. Sellman,Edward Blythe,Hongchao Liu,Yuanjiang Xiang,Jensen Tsan Hang Li,Jensen Tsan Hang Li,Dianyuan Fan,Jing Chen,Che Ting Chan,Shuang Zhang +15 more
TL;DR: In this paper, a 3D photonic Dirac point is observed in the microwave region with an elaborately designed metamaterial, where two symmetrically placed Dirac points are stabilized by electromagnetic duality symmetry.
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PT symmetric Floquet topological phase
TL;DR: In this article, the existence of Floquet topological insulators for symmetric non-Hermitian Hamiltonians was studied and an array of waveguide in 1D with periodically changing nonhermitian potential was considered.
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Topological Rainbow Concentrator Based on Synthetic Dimension
TL;DR: In this paper, a method to realize a rainbow concentrator of topological photonic states based on the synthetic dimension concept is proposed, where the translational degree of freedom of the nanostructures inside the unit cell of a two-dimensional photonic crystal is constructed using a translational deformation, which gives rise to robust interface states at different frequencies.
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Topologically protected Dirac plasmons in graphene
TL;DR: In this paper, the authors proposed and provided a theoretical proof-of-principle demonstration for highly confined topologically protected optical states to be realized at infrared frequencies in a simple 2D material structure-a periodically patterned graphene monolayer subject to a magnetic field below 1 tesla.
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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Xiao-Liang Qi,Shou-Cheng Zhang +1 more
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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.