Observation of exciton polariton condensation in a perovskite lattice at room temperature

摘要

Exciton polariton are bosonic quasiparticles arising from the strong coupling between excitons and cavity photons. Thanks to the low effective mass inherited from their photonic components and strongly interacting bosonic nature from the constituent excitons, they are regarded as promising candidates to realize Boson-Einstein Condensation at much higher temperatures, compared with conventional atom cases. With the development of microfabrication techniques, polariton condensates can be precisely trapped in periodic potentials to form artificial lattices, which have led to a wide range of important applications, such as ultrafast simulators of the X-Y Hamiltonian, topological Chern insulators and topological lasers. However, early demonstrations mainly work with GaAs system, which are limited to liquid helium temperatures owing to the low binding energy of GaAs excitons.