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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Engineering topological edge states in two dimensional magnetic photonic crystal
TL;DR: Based on a perturbative approach, a simple and efficient method to engineer the topological edge states in two-dimensional magnetic photonic crystals was proposed in this article, which can be constructed and varied by altering the parameters of the microstructure according to the field-energy distributions of the Bloch states at the related Bloch wave vectors.
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A chemical theory of topological insulators
Ángel Martín Pendás,Julia Contreras-García,Fernanda Pinilla,José Mella,Carlos Cárdenas,Francisco Muñoz +5 more
TL;DR: It is shown how several key concepts about TIs may be rephrased in terms of traditional chemical concepts by using Lewis resonance structures and bonding descriptors that characterize electron delocalization in real space.
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Distortionless Pulse Transmission in Valley Photonic Crystal Slab Waveguide
Fu-Long Shi,Yuan Cao,Xiao Dong Chen,Jian-Wei Liu,Wen-Jie Chen,Min Chen,Min Chen,Jian-Wen Dong +7 more
TL;DR: In this paper, using time-domain measurements in the microwave regime, a sharply bended waveguide is constructed with the domain wall between two valley photonic crystal slabs for high-fidelity optical pulse signal transmission and the development of high-performance optical elements, such as photonic circuits or optical delay lines.
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Optomechanical Kerker effect
TL;DR: In this paper, the authors acknowledge support by the Russian President Grant No. MD-5791 and the Foundation for the Advancement of Mathematical Physics and Mathematics (BASIS) and the Presidium of RAS (Program 32, Nanomaterials).
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Realizing Topological Mott Insulators from the RKKY Interaction
TL;DR: In this article, topological insulating phases in a fermion-fermion mixture on the honeycomb lattice were obtained without resorting to artificial gauge fields or spin-orbit couplings and considering only local interactions.
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.