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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Observation of fractal higher-order topological states in acoustic metamaterials.
Shengjie Zheng,Xianfeng Man,Ze-Lin Kong,Zhiping Liu,Guiju Duan,Ning Chen,Dejie Yu,Jian-Hua Jiang,Baizhan Xia +8 more
TL;DR: In this article , a Sierpiński acoustic metamaterial with fractal geometry was investigated and the edge and corner states were uncovered. But the results revealed the unconventional spectrum and rich wave patterns of the corner states with consistent simulations and experiments.
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Chiral topological excitons in the monolayer transition metal dichalcogenides.
TL;DR: In this article, the chiral topological excitons emerging in the monolayer transition metal dichalcogenides were theoretically investigated, where a bulk energy gap of valley exciton is opened up by a position dependent external magnetic field.
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Photonic band structure design using persistent homology.
TL;DR: In this paper, persistent homology is used for characterizing and optimizing band structures of periodic photonic media using the honeycomb photonic lattice Haldane model as an example.
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Universal momentum-to-real-space mapping of topological singularities
Xiuying Liu,Shiqi Xia,Ema Jajtić,Daohong Song,Daohong Song,Denghui Li,Liqin Tang,Liqin Tang,Daniel Leykam,Jingjun Xu,Jingjun Xu,Hrvoje Buljan,Hrvoje Buljan,Zhigang Chen,Zhigang Chen,Zhigang Chen +15 more
TL;DR: In this article, a universal mapping of the topology of Dirac-like cones from momentum space to real space was demonstrated by exciting the cones in photonic honeycomb lattices with vortex beams of topological charge l, optimally aligned for a chosen pseudospin state s, leading to direct observation of topology charge conversion that follows the rule of l to l+2s.
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.