Exciton polaritons, the part-light and part-matter quasiparticles in semiconductor optical cavities, are promising for exploring Bose–Einstein condensation, non-equilibrium many-body physics and analogue simulation at elevated temperatures. However, a room-temperature polaritonic platform on par with the GaAs quantum wells grown by molecular beam epitaxy at low temperatures remains elusive. The operation of such a platform calls for long-lifetime, strongly interacting excitons in a stringent material system with large yet nanoscale-thin geometry and homogeneous properties. Here, we address this challenge by adopting a method based on the solution synthesis of excitonic halide perovskites grown under nanoconfinement. Such nanoconfinement growth facilitates the synthesis of smooth and homogeneous single-crystalline large crystals enabling the demonstration of XY Hamiltonian lattices with sizes up to 10 × 10. With this demonstration, we further establish perovskites as a promising platform for room temperature polaritonic physics and pave the way for the realization of robust mode-disorder-free polaritonic devices at room temperature.

激子极化子是半导体光腔中的部分光和部分物质准粒子，有望用于探索玻色-爱因斯坦凝聚、非平衡多体物理和高温下的模拟模拟。然而，与在低温下通过分子束外延生长的 GaAs 量子阱相媲美的室温极化子平台仍然难以捉摸。这种平台的运行需要在具有大而纳米级薄几何形状和均匀特性的严格材料系统中具有长寿命、强相互作用的激子。在这里，我们通过采用一种基于在纳米限制下生长的激子卤化物钙钛矿的溶液合成方法来应对这一挑战。XY哈密顿晶格，尺寸高达 10 × 10。通过该演示，我们进一步将钙钛矿确立为室温极化物理的有前途的平台，并为在室温下实现鲁棒的无模式无序极化器件铺平道路。