Journal
NANOPHOTONICS
Volume 9, Issue 5, Pages 1161-1176Publisher
WALTER DE GRUYTER GMBH
DOI: 10.1515/nanoph-2020-0043
Keywords
artificial Dirac materials; flat-band states; real-space topology; Kagome and Lieb lattices; super-honey-comb lattices; noncontractible loop states
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Funding
- National key RAMP
- D Program of China [2017YFA0303800]
- National Natural Science Foundation [91750204, 11922408, 11674180, 11704102]
- PCSIRT [IRT0149]
- 111 Project in China [B07013]
- Institute for Basic Science in Korea [IBS-R024-Y1]
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Flat-band systems have attracted considerable interest in different branches of physics in the past decades, providing a flexible platform for studying fundamental phenomena associated with completely dispersionless bands within the whole Brillouin zone. Engineered flat-band structures have now been realized in a variety of systems, in particular, in the field of photonics. Flat-band localization, as an important phenomenon in solid-state physics, is fundamentally interesting in the exploration of exotic ground-state properties of many-body systems. However, direct observation of some flat-band phenomena is highly nontrivial in conventional condensed-matter systems because of intrinsic limitations. In this article, we briefly review recent developments on flat-band localization and the associated phenomena in various photonic lattices, including compact localized states, unconventional line states, and noncontractible loop states. We show that the photonic lattices offer a convenient platform for probing the underlying physics of flat-band systems, which may provide inspiration for exploring the fundamentals and applications of flat-band physics in other structured media from metamaterials to nanophotonic materials.
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