Condensation of exciton polaritons in a flatband of a deformed triangle lattice at room temperature
Abstract
Flatbands in the periodic electronic or photonic structures attract intensive attention due to their infinite effective mass, which leads to plenty of physical phenomena, for example, the localization of electrons or photons. However, direct observation of bosonic condensate in the triangle lattice with tunable flatband at room temperature is not realized yet. In this work, we fabricated a microcavity with a triangle lattice potential and perovskite CsPbBr3 as the gain material at room temperature. In this microcavity, polariton bands due to the coupling among the triangle lattice are observed, and exciton polariton condensation is realized. By deforming the triangle lattice such that the coupling between the potential sites is modulated, two exciton polariton flatbands with different energies are observed. Above threshold, exciton polaritons condense at the higher-energy flatband, which experiences larger gain. Our results offer a method to investigate the polariton flatband induced interesting physical phenomenon by engineering a two-dimensional photonic lattice at room temperature.
Article Details
Journal Info
Applied Physics Letters
American Institute of Physics
Authors (14)
Jing Wei
State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Science and Engineering
Xiaokun Zhai
Department of Physics, School of Science, Tianjin University 1 , Tianjin 300072,
Qiang Ai
Chunzi Xing
Department of Physics, School of Science, Tianjin University 1 , Tianjin 300072,
Xinmiao Yang
Department of Physics, School of Science, Tianjin University 1 , Tianjin 300072,
Yuan Cai
School of Chemical Engineering and Technology, Key Laboratory for Green Chemical Technology of Ministry of Education, Tianjin University
Tuo Wang
Xianxiong He
College of New Materials and Chemical Engineering, Beijing Institute of Petrochemical Technology 5 , Beijing 102617,
Dongxue Wang
Sen An
Department of Physics, School of Science, Tianjin University 1 , Tianjin 300072,
Tianyu Liu
International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of Education, Institute of Microscale Optoelectronics
Haitao Dai
Liefeng Feng
Department of Physics, School of Science, Tianjin University 1 , Tianjin 300072,
Tingge Gao
Department of Physics, School of Science, Tianjin University 1 , Tianjin 300072,