Moiré coupling in transition metal dichalcogenides (TMDCs) superlattices introduces flat minibands that enable strong electronic correlation and fascinating correlated states, and it also modifies the strong Coulomb-interaction-driven excitons and gives rise to moiré excitons. Here, we introduce the layer degree of freedom to the WSe₂/WS₂ moiré superlattice by changing WSe₂ from monolayer to bilayer and trilayer. We observe systematic changes of optical spectra of the moiré excitons, which directly confirm the highly interfacial nature of moiré coupling at the WSe₂/WS₂ interface. In addition, the energy resonances of moiré excitons are strongly modified, with their separation significantly increased in multilayer WSe₂/monolayer WS₂ moiré superlattice. The additional WSe₂ layers also modulate the strong electronic correlation strength, evidenced by the reduced Mott transition temperature with added WSe₂ layer(s). The layer dependence of both moiré excitons and correlated electronic states can be well described by our theoretical model. Our study presents a new method to tune the strong electronic correlation and moiré exciton bands in the TMDCs moiré superlattices, ushering in an exciting platform to engineer quantum phenomena stemming from strong correlation and Coulomb interaction.

过渡金属二硫属化物 (TMDC) 超晶格中的莫尔耦合引入了平坦的微带，可实现强电子相关性和迷人的相关态，并且它还改变了强库仑相互作用驱动的激子并产生莫尔激子。_{在这里，我们通过将WSe 2}从单层变为双层和三层，将层自由度引入WSe ₂ /WS ₂莫尔超晶格。我们观察到莫尔激子光谱的系统变化，这直接证实了在WSe ₂ /WS _{2处莫尔耦合的高度界面性质}界面。此外，莫尔激子的能量共振被强烈改变，在多层WSe ₂ /单层WS ₂莫尔超晶格中它们的分离显着增加。额外的WSe ₂层还调节强电子相关强度，这由添加的WSe ₂层降低的莫特转变温度证明。我们的理论模型可以很好地描述莫尔激子和相关电子态的层依赖性。我们的研究提出了一种调整 TMDC 莫尔超晶格中强电子相关性和莫尔激子带的新方法，为设计源自强相关性和库仑相互作用的量子现象开辟了一个令人兴奋的平台。