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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Valley-dependent corner states in honeycomb photonic crystals without inversion symmetry.
TL;DR: In this article, the valley-dependent Chern numbers in momentum space were studied in the absence of inversion symmetry in honeycomb lattice and the topological corner states appeared for 60° degree corners, but absent for other corners, which can be understood as the sign flip of valley Chern number at the corner.
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Observation of edge waves in a two-dimensional Su-Schrieffer-Heeger acoustic network
TL;DR: In this article, the authors report the acoustic realization of the two-dimensional (2D) Su-Schrieffer-Heeger (SSH) model in a simple network of air channels and analyze the steady state dynamics of the system using a set of discrete equations for the acoustic pressure, leading to the 2D SSH Hamiltonian matrix without using tight binding approximation.
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Topological Valley Hall Edge State Lasing
Hua Zhong,Yongdong Li,Daohong Song,Yaroslav V. Kartashov,Yiqi Zhang,Yanpeng Zhang,Zhigang Chen +6 more
TL;DR: In this paper, two types of valley Hall edge lasing modes are found by shaping the gain landscape along the domain walls, which results in the formation of stable nonlinear dissipative excitations localized on the edge of the structure.
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Bismuth Telluride nanocrystal: broadband nonlinear response and its application in ultrafast photonics.
TL;DR: The effectiveness of the hybrid liquid exfoliation method to prepare bismuth telluride into nanocrystals is confirmed, and the broadband nonlinear optical response and ultrafast photonics application potential of the nanocry crystals are confirmed.
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One-way interfacial waves in a flexural plate with chiral double resonators
TL;DR: A new approach to control flexural elastic waves in a structured chiral plate by employing double resonators, which consist of two beams attached to gyroscopic spinners, which act to couple flexural and rotational deformations, hence inducing chirality in the system.
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.