AI 中文总结
研究采用光致发光激发光谱，解析MoSe₂/WSe₂异质结构中层间激子的类里德伯高能态，发现其受扭转角影响弱，相关计算验证了共振峰归属，为探测该类高能态提供了实验方法。
AI 中文摘要
范德华异质结构中层间激子（IXs）的高能态对于理解多体相互作用和非线性光学现象具有重要意义，但目前仍未得到充分探索。本研究采用光致发光激发（PLE）光谱技术，成功解析出MoSe$_2$/WSe$_2$异质结构中层间激子的类里德伯激发态序列，观测到多个位于层内激子能量以下的PLE共振峰，将其归为层间激子的类2s、3s和4s态。这些共振峰在不同扭转角的异质结构中均稳定存在，表明高能态光谱受扭转角的影响较弱。结合屏蔽库仑相互作用的Wannier激子计算，能够复现测得的类里德伯序列的整体能量尺度和定性趋势，验证了共振峰的归属。研究结果证实，PLE技术为范德华异质结构中此前未被探索的层间激子高能态提供了直接的实验探测途径。
英文摘要
High-energy states of interlayer excitons (IXs) in van der Waals heterostructures remain largely unexplored despite their importance for understanding many-body interactions and nonlinear optical phenomena. Here, we use photoluminescence excitation (PLE) spectroscopy to resolve a Rydberg-like series of excited IX states in MoSe$_2$/WSe$_2$ heterostructures. We observe multiple PLE resonances below the intralayer exciton energies, which we assign to the 2s-, 3s-, and 4s-like states of the IXs. These resonances are consistently observed across heterostructures with different twist angles, indicating that the high-energy state spectrum is only weakly affected by the twist angle. Wannier-exciton calculations incorporating screened Coulomb interactions reproduce the overall energy scale and qualitative trends of the measured Rydberg-like series, supporting the assignment of the observed resonances. Our findings demonstrate that PLE provides direct experimental access to the previously unexplored high-energy IX states in van der Waals heterostructures.
