Higher-order topological states in photonic kagome crystals with long-range interactions

被引：362

作者：

Li, Mengyao ^{[1
,2
]}

Zhirihin, Dmitry ^{[1
,3
]}

Gorlach, Maxim ^{[3
]}

Ni, Xiang ^{[1
,2
]}

Filonov, Dmitry ^{[4
]}

Slobozhanyuk, Alexey ^{[3
]}

Alu, Andrea ^{[1
,2
,5
]}

Khanikaev, Alexander B. ^{[1
,2
]}

机构：

[1] CUNY City Coll, Grove Sch Engn, Dept Elect Engn, New York, NY 10031 USA

[2] CUNY, Grad Ctr, Phys Program, New York, NY 10017 USA

[3] ITMO Univ, Dept Nanophoton & Metamat, St Petersburg, Russia

[4] Moscow Inst Phys & Technol, Ctr Photon & 2D Mat, Dolgoprudnyi, Russia

[5] CUNY, Adv Sci Res Ctr, Photon Initiat, New York, NY 10021 USA

来源：

NATURE PHOTONICS | 2020年 / 14卷 / 02期

基金：

俄罗斯科学基金会; 美国国家科学基金会; 俄罗斯基础研究基金会;

关键词：

PHASE;

D O I：

10.1038/s41566-019-0561-9

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Photonic topological insulators enable topological boundary modes that are resilient to defects and disorder, irrespective of manufacturing precision. This property is known as topological protection. Although originally limited to dimensionality of modes one lower than that of topological insulators, the recently discovered higher-order topological insulators (HOTIs) offer topological protection over an extended range of dimensionalities. Here, we introduce a photonic HOTI with kagome lattice that exhibits topological bulk polarization, leading to the emergence of one-dimensional edge states, as well as higher-order zero-dimensional states confined to the corners of the structure. Interestingly, in addition to the corner states due to nearest-neighbour interactions, we discover a new class of topological corner states induced by long-range interactions and specific to photonic systems. Our findings demonstrate that photonic HOTIs possess richer physics than their condensed-matter counterparts, offering opportunities for engineering novel designer electromagnetic states with unique topological robustness. One- and zero-dimensional optical states are revealed in photonic higher-order topological insulators.

引用

页码：89 / +

页数：7

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