Localized defect modes in a nonresonantly pumped exciton-polariton condensate
Ting-Wei Chen1*, Shih-Da Jheng2, Weng-Feng Hsieh3, Szu-Cheng Cheng1
1Department of Optoelectric Physics, Chinese Culture University, Taipei, Taiwan
2Institute of Physics, National Chiao Tung University, Hsinchu, Taiwan
3Department of Photonics and Institute of Electro-Optical Engineering, National Chiao Tung University, Hsinchu, Taiwan
* presenting author:Ting-Wei Chen, email:ctw@ulive.pccu.edu.tw
The non-equilibrium and nonlinear defect modes (NNDMs), localized by a defect in a microcavity-polariton condensate (MPC), are studied. There are three kinds of NNDMs: bright NNDM, bound state with two dark solitons for an attractive defect potential, and gray soliton bound by a defect for a repulsive defect potential. We find that the stable NNDMs in a non-equilibrium MPC are the bright NNDM and gray soliton bound by a defect. The bright NNDM, which owns the hyperbolic cotangent form, is a bright localized state existing in a uniform MPC. The bright NNDM is a unique state occurring in a non-equilibrium MPC that owns pump-dissipation and repulsive-nonlinearity characters. No such state can exist in an equilibrium system with repulsive nonlinearity.

Keywords: exciton-polariton condensate, soliton, defect mode