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Title: Optical switching of topological phase in a perovskite polariton lattice
Authors: Su, Rui
Ghosh, Sanjib
Liew, Timothy Chi Hin
Xiong, Qihua
Keywords: Science::Mathematics
Issue Date: 2021
Source: Su, R., Ghosh, S., Liew, T. C. H. & Xiong, Q. (2021). Optical switching of topological phase in a perovskite polariton lattice. Science Advances, 7(21), eabf8049-.
Project: MOE2018-T3-1-002
Journal: Science Advances 
Abstract: Strong light-matter interaction enriches topological photonics by dressing light with matter, which provides the possibility to realize active nonlinear topological devices with immunity to defects. Topological exciton polaritons-half-light, half-matter quasiparticles with giant optical nonlinearity-represent a unique platform for active topological photonics. Previous demonstrations of exciton polariton topological insulators demand cryogenic temperatures, and their topological properties are usually fixed. Here, we experimentally demonstrate a room temperature exciton polariton topological insulator in a perovskite zigzag lattice. Polarization serves as a degree of freedom to switch between distinct topological phases, and the topologically nontrivial polariton edge states persist in the presence of onsite energy perturbations, showing strong immunity to disorder. We further demonstrate exciton polariton condensation into the topological edge states under optical pumping. These results provide an ideal platform for realizing active topological polaritonic devices working at ambient conditions, which can find important applications in topological lasers, optical modulation, and switching.
ISSN: 2375-2548.
DOI: 10.1126/sciadv.abf8049
DOI (Related Dataset): 10.21979/N9/XTN8VL
Schools: School of Physical and Mathematical Sciences 
Research Centres: MajuLab
Rights: © 2021 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S.Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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