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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Robust Light State by Quantum Phase Transition in Non-Hermitian Optical Materials
TL;DR: It is shown that quantum phase transition can be strategically exploited in non-Hermitian optical systems to design novel robust light state that persists itself under topological impurities and disorder.
Journal ArticleDOI
Observation of valleylike edge states of sound at a momentum away from the high-symmetry points
Baizhan Xia,Shengjie Zheng,Tingting Liu,Junrui Jiao,Ning Chen,Hongqing Dai,Dejie Yu,Jian Liu +7 more
TL;DR: In this article, the authors demonstrate a unique valley-like phononic crystal with position-varying Dirac cones at the high-symmetry lines of the Brillouin zone boundary.
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Photonic Dirac monopoles and skyrmions: spin-1 quantization
Todd Van Mechelen,Zubin Jacob +1 more
TL;DR: In this article, the concept of photonic Dirac monopole was introduced for photonic crystals, metamaterials and 2D materials by utilizing the Dirac-Maxwell correspondence.
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Topological Photonic Crystals: Physics, Designs, and Applications
TL;DR: In this paper , the physics of topological photonic crystals with different dimensions, models, and topological phases are presented, as well as the application in passive and active photonic devices.
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Reprogrammable plasmonic topological insulators with ultrafast control.
TL;DR: In this paper, a reprogrammable plasmonic topological insulator is presented, where the topological propagation route can be dynamically changed at nanosecond-level switching time, leading to an experimental demonstration of ultrafast multi-channel optical analog-digital converter.
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.