Higher-order band topology

Nature Reviews Physics, Journal Year: 2021, Volume and Issue: 3(7), P. 520 - 532

Published: June 15, 2021

Language: Английский

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Highlighting photonics: looking into the next decade

eLight, Journal Year: 2021, Volume and Issue: 1(1)

Published: June 7, 2021

Abstract Let there be light –to change the world we want to be! Over past several decades, and ever since birth of first laser, mankind has witnessed development science light, as light-based technologies have revolutionarily changed our lives. Needless say, photonics now penetrated into many aspects technology, turning an important dynamically changing field increasing interdisciplinary interest. In this inaugural issue eLight , highlight a few emerging trends in that think are likely major impact at least upcoming decade, spanning from integrated quantum computing, through topological/non-Hermitian topological insulator lasers, AI-empowered nanophotonics photonic machine learning. This Perspective is by no means attempt summarize all latest advances photonics, yet wish subjective vision could fuel inspiration foster excitement scientific research especially for young researchers who love .

Language: Английский

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Observation of hybrid higher-order skin-topological effect in non-Hermitian topolectrical circuits

Nature Communications, Journal Year: 2021, Volume and Issue: 12(1)

Published: Dec. 10, 2021

Abstract Robust boundary states epitomize how deep physics can give rise to concrete experimental signatures with technological promise. Of late, much attention has focused on two distinct mechanisms for robustness—topological protection, as well the non-Hermitian skin effect. In this work, we report realizations of hybrid higher-order skin-topological effect, in which effect selectively acts only topological modes, not bulk modes. Our experiments, are performed specially designed non-reciprocal 2D and 3D topolectrical circuit lattices, showcases pumping localization dynamically interplays form various like skin-topological, skin-topological-topological states, states. Realized through our highly versatile scalable platform, theses have no Hermitian nor lower-dimensional analog, pave way applications switching sensing simultaneous non-trivial interplay localizations.

Language: Английский

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Topological Photonic Crystals: Physics, Designs, and Applications

Laser & Photonics Review, Journal Year: 2022, Volume and Issue: 16(4)

Published: Feb. 15, 2022

The recent research of topological photonics has not only proposed and realized novel phenomena such as one-way broadband propagation robust transport light, but also designed fabricated photonic devices with high-performance indexes which are immune to fabrication errors defects or disorders. Photonic crystals, periodic optical structures the advantages good light field confinement multiple adjusting degrees freedom, provide a powerful platform control flow light. With topology defined in reciprocal space, crystals have been widely used reveal different phases demonstrate functionalities. In this review, we present physics dimensions, models phases. design methods introduced. Furthermore, review applications passive active photonics. These researches pave way applying practical devices.

Language: Английский

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Nonlinear second-order photonic topological insulators

Nature Physics, Journal Year: 2021, Volume and Issue: 17(9), P. 995 - 1000

Published: July 1, 2021

Higher-order topological insulators (HOTI) are a novel phase beyond the framework of conventional bulk-boundary correspondence. In these peculiar systems, topologically nontrivial boundary modes characterized by co-dimension at least two. Despite several promising preliminary considerations regarding impact nonlinearity in such flourishing field experimental HOTI research has thus far been confined to linear evolution states. As such, observation interplay between and dynamics higher-order phases conservative systems remains elusive. our work, we experimentally demonstrate nonlinear corner Our photonic platform enables us observe states as well formation solitons structures. work paves way towards exploration properties matter regime, may herald new class compact devices that harnesses intriguing features topology an on-demand fashion.

Language: Английский

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Multipolar lasing modes from topological corner states

Nature Communications, Journal Year: 2020, Volume and Issue: 11(1)

Published: Nov. 13, 2020

Topological photonics provides a fundamental framework for robust manipulation of light, including directional transport and localization with built-in immunity to disorder. Combined an optical gain, active topological cavities hold special promise design light-emitting devices. Most studies date have focused on lasing at edges finite systems or domain walls. Recently discovered higher-order phases enable strong high-quality confinement light the corners. Here, we demonstrate action corner states in nanophotonic structures. We identify several multipole modes distinct emission profiles via hyperspectral imaging discern signatures non-Hermitian radiative coupling leaky states. In addition, depending pump position large-size cavity, generate selectively from either edge within bandgap. Our provide direct observation multipolar engineered collective resonances nanostructures.

Language: Английский

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Observation of a Higher-Order Topological Bound State in the Continuum

Physical Review Letters, Journal Year: 2020, Volume and Issue: 125(21)

Published: Nov. 17, 2020

Higher-order topological insulators are a recently discovered class of materials that can possess zero-dimensional localized states regardless the dimension system. Here, we experimentally demonstrate corner-localized modes higher-order systems be symmetry-protected bound in continuum; these do not hybridize with surrounding bulk lattice even absence band gap. This observation expands scope bulk-boundary correspondence by showing protected boundary-localized found within bands, addition to being between them.

Language: Английский

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Non-Hermitian morphing of topological modes

Nature, Journal Year: 2022, Volume and Issue: 608(7921), P. 50 - 55

Published: Aug. 3, 2022

Language: Английский

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Experimental Observation of Higher-Order Topological Anderson Insulators

Physical Review Letters, Journal Year: 2021, Volume and Issue: 126(14)

Published: April 6, 2021

Recently, a new family of symmetry-protected higher-order topological insulators has been proposed and was shown to host lower-dimensional boundary states. However, with the existence strong disorder in bulk, crystal symmetry is broken, associated corner states are disappeared. It well known that emergence robust edge quantized transport can be induced by adding sufficient disorders into topologically trivial insulator, so-called Anderson insulator. The question whether also cause phase. This not so far, because interactions between phases completely different from those first-order system. Here, we demonstrate theoretically disorder-induced state fraction charge appear modified Haldane model. In experiments, construct classical analog such using electric circuits observe through voltage measurement. Our work defies conventional view detrimental phase, offers feasible platform investigate interaction phases.

Language: Английский

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Dirac-vortex topological cavities

Nature Nanotechnology, Journal Year: 2020, Volume and Issue: 15(12), P. 1012 - 1018

Published: Oct. 19, 2020

Language: Английский

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