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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Electromagnetic Confinement via Spin-Orbit Interaction in Anisotropic Dielectrics
TL;DR: The role of geometric phases on electromagnetic propagation over distances well exceeding the diffraction length is introduced, paving the way to a whole new family of guided waves and waveguides that do not rely on refractive index tailoring.
Journal ArticleDOI
Robust Fano resonance in the photonic valley Hall states
TL;DR: In this article, a photonic valley Hall insulator is proposed to resist bending domain walls and disorders by coupling the valley-dependent edge states with one double-degenerate cavity.
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Phase-dependent topological interface state and spatial adiabatic passage in a generalized Su-Schrieffer-Heeger model
TL;DR: In this paper, the Su-Schrieffer-Heeger model is extended to include an additional real intercell coupling and a complex intracell coupling whose phase can be interpreted as the Peierls phase associated with a synthetic gauge field.
Journal ArticleDOI
Quantum Topological Boundary States in Quasi-Crystals
Yao Wang,Yao Wang,Yao Wang,Yong-Heng Lu,Yong-Heng Lu,Jun Gao,Jun Gao,Jun Gao,Ke Sun,Zhi-Qiang Jiao,Zhi-Qiang Jiao,Hao Tang,Hao Tang,Xian-Min Jin,Xian-Min Jin,Xian-Min Jin +15 more
TL;DR: In this paper, the quantum features of single photons can be preserved in topological structures and the boundary states are experimentally observed at the genuine single-photon level, and the performance of the topological phase is demonstrated to protect the quantum feature against diffusion-induced decoherence in coupled waveguides and noise from the ambient environment, leading to a new avenue to quantum topological photonics and providing new possibilities for quantum materials and quantum technologies.
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Thermally tunable topological edge states for in-plane bulk waves in solid phononic crystals.
TL;DR: The tunable frequency for both topological band gaps and topologically protected edge states achieves the active control of the transport for in‐plane bulk waves, which may dramatically facilitate practical applications of novel phononic devices.
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.