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 phases and nonreciprocal edge states in non-Hermitian Floquet insulators
TL;DR: In this paper, the authors show that non-Hermitian Hamiltonians can indeed result in topological phases supporting non-reciprocal edge states propagating without dissipation, as well as regimes of dissipative and amplifying topological edge transport.
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Photonic anomalous quantum hall effect
TL;DR: In this paper, a photonic analogue of the anomalous quantum Hall insulator using a two-dimensional array of coupled ring resonators was realized using direct imaging and on-chip transmission measurements.
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Quantum and wave dynamical chaos in superconducting microwave billiards
Barbara Dietz,Achim Richter +1 more
TL;DR: In this paper, the authors present a new approach for the understanding of the phenomenon of dynamical tunneling which was developed on the basis of experiments that were performed recently with unprecedented precision, and give an insight into an ongoing project, where they investigate universal properties of (artificial) graphene with superconducting microwave photonic crystals that are enclosed in a microwave resonator, i.e. Dirac billiards.
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Photonic Floquet topological insulators in a fractal lattice
TL;DR: Fractal lattices structured as Sierpinski gasket composed of an array of evanescently coupled helical waveguides, found theoretically that photonic topological insulators can also exist in fractal lattice, comprising only edges—with no bulk at all.
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Experimental realization of on-chip topological nanoelectromechanical metamaterials
TL;DR: Topological nanoelectromechanical metamaterials are realized at the micrometre scale, using silicon nitride nanomembranes, opening the way for on-chip integrated acoustic components in high-frequency signal-processing applications.
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
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.