非周期图
云纹
光折变效应
凝聚态物理
材料科学
非线性系统
孤子
物理
离域电子
光子学
石墨烯
光学
纳米技术
量子力学
数学
组合数学
作者
Qidong Fu,Peng Wang,Changming Huang,Yaroslav V. Kartashov,Lluís Torner,V. V. Konotop,Fangwei Ye
出处
期刊:Nature Photonics
[Springer Nature]
日期:2020-08-24
卷期号:14 (11): 663-668
被引量:32
标识
DOI:10.1038/s41566-020-0679-9
摘要
Exploration of the impact of synthetic material landscapes featuring tunable geometrical properties on physical processes is a research direction that is currently of great interest because of the outstanding phenomena that are continually being uncovered. Twistronics and the properties of wave excitations in moiré lattices are salient examples. Moiré patterns bridge the gap between aperiodic structures and perfect crystals, thus opening the door to the exploration of effects accompanying the transition from commensurate to incommensurate phases. Moiré patterns have revealed profound effects in graphene-based systems1–5, they are used to manipulate ultracold atoms6,7 and to create gauge potentials8, and are observed in colloidal clusters9. Recently, it was shown that photonic moiré lattices enable observation of the two-dimensional localization-to-delocalization transition of light in purely linear systems10,11. Here, we employ moiré lattices optically induced in photorefractive nonlinear media12–14 to elucidate the formation of optical solitons under different geometrical conditions controlled by the twisting angle between the constitutive sublattices. We observe the formation of solitons in lattices that smoothly transition from fully periodic geometries to aperiodic ones, with threshold properties that are a pristine direct manifestation of flat-band physics11. Moiré lattices optically induced in photorefractive nonlinear media are used to explain the formation of optical solitons under different geometrical conditions controlled by the twisting angle between the constitutive sublattices.
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