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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Topology optimization of photonic crystals with exotic properties resulting from Dirac-like cones
TL;DR: In this article, the minimum of a collection of the local density of states corresponding to different judiciously selected sources is maximized by maximizing the minimum value of a Dirac-like cone for a doubly degenerate mode and a single mode at different desired frequencies.
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Topological Heat Transport and Symmetry-Protected Boson Currents
TL;DR: In this article, the stationary properties of a two-dimensional bosonic Hofstadter lattice coupled to two thermal baths in the quantum open-system formalism were analyzed, and a new concept of dissipative symmetry protection was proposed, where a set of discrete symmetries protected topological heat currents.
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Topological Nanophotonics: Toward Robust Quantum Circuits
TL;DR: The pioneering experimental efforts to understand the potential of topological protection on quantum photonic states and to outline a path toward robust quantum circuits are highlighted.
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Tunable in-plane topologically protected edge waves in continuum Kagome lattices
TL;DR: In this article, the authors reported the evidence of topologically protected edge waves (TPEWs) in the continuum Kagome lattice and showed the robustness of the supported energy transport, showing the amount of delocalized disorder the waveguide is immune to and how performances are affected by perturbations in the nominal parameters of the lattice.
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Tunable Nonlinear Topological Insulator for Acoustic Waves
Amir Darabi,Michael J. Leamy +1 more
TL;DR: Inspired by the quantum spin Hall effect, the authors in this article proposed a tunable nonlinear topological insulator for acoustic waves, which could be an ideal framework for lossless information transport.
References
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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
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.