Transition metal dichalcogenide moiré bilayers with spatially periodic potentials have emerged as a highly tunable platform for studying both electronic^1,2,3,4,5,6 and excitonic^{4,7,8,9,10,11,12,13} phenomena. The power of these systems lies in the combination of strong Coulomb interactions with the capability of controlling the charge number in a moiré potential trap. Electronically, exotic charge orders at both integer and fractional fillings have been discovered^2,5. However, the impact of charging effects on excitons trapped in moiré potentials is poorly understood. Here, we report the observation of moiré trions and their doping-dependent photoluminescence polarization in H-stacked MoSe₂/WSe₂ heterobilayers. We find that as moiré traps are filled with either electrons or holes, new sets of interlayer exciton photoluminescence peaks with narrow linewidths emerge about 7 meV below the energy of the neutral moiré excitons. Circularly polarized photoluminescence reveals switching from co-circular to cross-circular polarizations as moiré excitons go from being negatively charged and neutral to positively charged. This switching results from the competition between valley-flip and spin-flip energy relaxation pathways of photo-excited electrons during interlayer trion formation. Our results offer a starting point for engineering both bosonic and fermionic many-body effects based on moiré excitons¹⁴.

具有空间周期性电位的过渡金属二硫属化物莫尔双层已成为研究电子^{1、2、3、4、5、6}和激子^{4、7、8、9、10、11、12、13}现象的高度可调平台。这些系统的强大之处在于强库仑相互作用与控制莫尔势阱中电荷数的能力相结合。在电子方面，已经发现了整数和分数填充的奇异电荷顺序^2,5。然而，充电效应对捕获在莫尔电位中的激子的影响知之甚少。_{在这里，我们报告了在 H 堆叠 MoSe 2} /WSe ₂中对莫尔三重子及其掺杂依赖的光致发光偏振的观察异双层。我们发现，当莫尔陷阱充满电子或空穴时，新的具有窄线宽的层间激子光致发光峰出现在中性莫尔激子能量以下约 7 meV 处。当莫尔激子从带负电和中性变为带正电时，圆偏振光致发光揭示了从同圆偏振到交叉圆偏振的转换。这种转换是由层间三重离子形成过程中光激发电子的谷翻转和自旋翻转能量弛豫路径之间的竞争引起的。^{我们的结果为基于莫尔激子14}设计玻色子和费米子多体效应提供了一个起点。