Non-Hermitian topological exciton-polariton corner modes

Abstract

We theoretically study two-dimensional exciton-polariton lattices and predict that non-Hermitian topological corner modes can be formed under non-resonant pumping. As a generalization of the non-Hermitian skin effect, all eigenstates are localized at the two corners in our model. This is also a higher dimensional topology compared to other proposals in exciton-polariton systems and we find that it allows propagating signals in the bulk of the system to travel around defects, which is not possible in one-dimensional topological lattices or two-dimensional lattices with Hermitian edge states. Furthermore, as all polariton states are localized away from an excitation spot, the system offers an opportunity for more accurate measurement of the polariton-polariton interaction strength as the pump-induced exciton-reservoir is spatially separated from all polariton states.

References in corpus (13)

• Quantum fluids of light
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• Exciton-polariton condensates
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• Nonlinear second-order photonic topological insulators
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• Theory of Coupled Resonator Optical Waveguides (CROW) Exhibiting High Order Exceptional Points of Degeneracy
• Theory of Topological Corner State Laser in Kagome Waveguide Arrays
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Cited by in corpus (8)

• Topological Non-Hermitian skin effect
• Non-Bloch bands in two-dimensional non-Hermitian systems
• Generalized Quantum Geometric Tensor in a Non-Hermitian Exciton-Polariton System
• Non-Hermitian skin effect induced by Rashba-Dresselhaus spin-orbit coupling
• Tweaking Spectral Topology and Exceptional Points by Nonlinearity in Non-Hermitian Polariton Systems
• Topological enhancement of exciton-polariton coherence with non-Hermitian morphing
• Polariton Topological Insulators with Disclinations
• Fractal Polariton Topological Insulator