A strong Coulomb interaction could lead to a strongly bound exciton with high-order excited states, similar to the Rydberg atom. The interaction of giant Rydberg excitons can be engineered for a correlated ordered exciton array with a Rydberg blockade, which is promising for realizing quantum simulation. Monolayer transition metal dichalcogenides, with their greatly enhanced Coulomb interaction, are an ideal platform to host the Rydberg excitons in two dimensions. Here, we employ helicity-resolved magneto-photocurrent spectroscopy to identify Rydberg exciton states up to 11s in monolayer WSe₂. Notably, the radius of the Rydberg exciton at 11s can be as large as 214 nm, orders of magnitude larger than the 1s exciton. The giant valley-polarized Rydberg exciton not only provides an exciting platform to study the strong exciton–exciton interaction and nonlinear exciton response but also allows the investigation of the different interplay between the Coulomb interaction and Landau quantization, tunable from a low- to high-magnetic-field limit.

中文翻译：

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磁光电流谱揭示的单层 WSe2 中的巨谷极化里德堡激子。

强库仑相互作用可能导致具有高阶激发态的强束缚激子，类似于里德堡原子。巨里德堡激子的相互作用可以设计为具有里德堡阻滞的相关有序激子阵列，这有望实现量子模拟。单层过渡金属二硫属化物具有大大增强的库仑相互作用，是在二维中承载里德堡激子的理想平台。在这里，我们采用螺旋度分辨磁光电流谱来识别单层 WSe _{2 中}长达 11 秒的里德堡激子态. 值得注意的是，里德堡激子在 11s 的半径可以大到 214 nm，比 1s 激子大几个数量级。巨大的谷极化里德堡激子不仅提供了一个令人兴奋的平台来研究强激子 - 激子相互作用和非线性激子响应，而且还允许研究库仑相互作用和朗道量子化之间的不同相互作用，可从低到高调节磁场极限。