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 Fano resonance in a topological mechanical beam
TL;DR: In this article, a robust Fano mechanical resonance with topological protection was achieved by engineering band inversion of two different vibrating symmetries of a pillared beam that gives rise to dark and bright edge modes.
Journal ArticleDOI
Photonic Floquet topological insulators in atomic ensembles
Yiqi Zhang,Zhenkun Wu,Milivoj R. Belic,Huaibin Zheng,Zhiguo Wang,Min Xiao,Min Xiao,Yanpeng Zhang +7 more
TL;DR: In this article, the feasibility of realizing a photonic Floquet topological insulator (PFTI) in an atomic ensemble is demonstrated, where the interference of three coupling fields will split energy levels periodically, to form a periodic refractive index structure with honeycomb profile that can be adjusted by different frequency detunings and intensities of the coupling fields.
Journal ArticleDOI
Cavity Quantum Electrodynamics with Second‐Order Topological Corner State
Xin Xie,Weixuan Zhang,Xiaowu He,Shiyao Wu,Jianchen Dang,Kai Peng,Feilong Song,Longlong Yang,Haiqiao Ni,Zhichuan Niu,Can Wang,Kuijuan Jin,Xiangdong Zhang,Xiulai Xu +13 more
TL;DR: In this article, a topological photonic crystal cavity is designed and fabricated into GaAs slabs with quantum dots embedded, and the enhancement of photoluminescence intensity and emission rate are both observed when the quantum dot is on resonance with the corner state.
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Parity-Time Symmetry in Non-Hermitian Complex Optical Media
TL;DR: It can be anticipated that this trendy field of interest will be indispensable in providing new perspectives in maneuvering the flow of light in the diverse physical platforms in optics, photonics, condensed matter, optoelectronics, and beyond, and will offer distinctive application prospects in novel functional materials.
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Experimental Realization of Type-II Weyl Points and Fermi Arcs in Phononic Crystal.
Boyang Xie,Hui Liu,Hua Cheng,Hua Cheng,Zhengyou Liu,Shuqi Chen,Shuqi Chen,Jianguo Tian,Jianguo Tian +8 more
TL;DR: The topological transitions observed at the WP frequencies and the topological surface acoustic waves between the Weyl frequencies are demonstrated, which are in good accordance with the theoretical analyses.
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.