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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Topological Phases of Non-Hermitian Systems
Zongping Gong,Yuto Ashida,Kohei Kawabata,Kazuaki Takasan,Sho Higashikawa,Masahito Ueda,Masahito Ueda +6 more
TL;DR: In this paper, a coherent framework of topological phases of non-Hermitian Hamiltonians was developed, and the K-theory was applied to systematically classify all the topology phases in the Altland-Zirnbauer classes in all dimensions.
Journal ArticleDOI
Geometric phase and band inversion in periodic acoustic systems
TL;DR: The behavior of sound waves in phononic crystals is similar to that of electrons in solids as mentioned in this paper, and phononic band inversion and Zak phases have been measured for a 1D phononic system.
Journal ArticleDOI
Robust reconfigurable electromagnetic pathways within a photonic topological insulator
Xiaojun Cheng,Camille Jouvaud,Xiang Ni,S. Hossein Mousavi,Azriel Z. Genack,Alexander B. Khanikaev +5 more
TL;DR: Robust propagation along reconfigurable pathways defined by synthetic gauge fields within a topological photonic metacrystal domains is demonstrated and provides a framework for freely steering electromagnetic radiation within photonic structures.
Journal ArticleDOI
All-Si valley-hall photonic topological insulator
Tzuhsuan Ma,Gennady Shvets +1 more
TL;DR: In this paper, an all-Si photonic topological insulator (PTI) was proposed that emulates the quantum-valley-Hall (QVH) effect with backscattering-free edge states.
Journal ArticleDOI
Observation of topological edge states in parity-time-symmetric quantum walks
Lei Xiao,Xiang Zhan,Zhihao Bian,Kunkun Wang,X. Zhang,X. P. Wang,Jian Li,Ken Mochizuki,Dakyeong Kim,Norio Kawakami,Wei Yi,Hideaki Obuse,Barry C. Sanders,Peng Xue,Peng Xue +14 more
TL;DR: In this article, spontaneous parity and topological edge states are observed in a photonic non-Hermitian system with a quantum walk interferometer, where topological parity is achieved by time symmetry breaking.
References
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