Nonlinear higher-order polariton topological insulator

被引：31
作者：
Zhang, Yiqi [1 ,2 ]
Kartashov, Y., V [3 ,4 ]
Torner, L. [3 ,5 ]
Li, Yongdong [1 ,2 ]
Ferrando, A. [6 ]
机构：
[1] Xi An Jiao Tong Univ, Key Lab Phys Elect & Devices, Minist Educ, Xian 710049, Peoples R China
[2] Xi An Jiao Tong Univ, Shaanxi Key Lab Informat Photon Tech, Sch Elect & Informat Engn, Xian 710049, Peoples R China
[3] Barcelona Inst Sci & Technol, ICFO Inst Ciencies Foton, Castelldefels 08860, Barcelona, Spain
[4] Russian Acad Sci, Inst Spect, Moscow 108840, Russia
[5] Univ Politecn Cataluna, Barcelona 08034, Spain
[6] Univ Valencia, Dept Opt, InterTech, Interdisciplinary Modeling Grp, Burjassot 46100, Valencia, Spain
来源：
OPTICS LETTERS | 2020年 / 45卷 / 17期
基金：
中国国家自然科学基金;
关键词：
Topological insulators - Phonons - Electric insulators - Polariton - Photons;
D O I：
10.1364/OL.396039
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We address the resonant response and bistability of the exciton-polariton corner states in a higher-order nonlinear topological insulator realized with a kagome arrangement of microcavity pillars. Such states are resonantly excited and exist due to the balance between pump and losses, on one hand, and between nonlinearity and dispersion in inhomogeneous potential landscape, on the other hand, for pump energy around eigen-energies of corresponding linear localized modes. Localization of the nonlinear corner states in a higher-order topological insulator can be efficiently controlled by tuning pump energy. We link the mechanism of corner state formation with symmetry of the truncated kagome array. Corner states coexist with densely packed edge states but are well isolated from them in energy. Nonlinear corner states persist even in the presence of perturbations in a corner microcavity pillar. (C) 2020 Optical Society of America
引用
收藏
页码：4710 / 4713
页数：4
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