Moiré superlattices in transition metal dichalcogenide bilayers provide a platform for exploring strong correlations with optical spectroscopy. Despite the observation of rich Mott-Wigner physics stemming from an interplay between the periodic potential and Coulomb interactions, the absence of tunnel coupling–induced hybridization of electronic states has ensured a classical layer degree of freedom. We investigated a MoSe₂ homobilayer structure where interlayer coherent tunneling allows for electric field–controlled manipulation and measurement of the ground-state hole-layer pseudospin. We observed an electrically tunable two-dimensional Feshbach resonance in exciton-hole scattering, which allowed us to control the strength of interactions between excitons and holes located in different layers. Our results may enable the realization of degenerate Bose-Fermi mixtures with tunable interactions.

中文翻译：

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扭曲双层半导体中的电可调 Feshbach 共振

过渡金属二硫属化物双层中的莫尔超晶格为探索与光谱学的强相关性提供了一个平台。尽管从周期性势能和库仑相互作用之间的相互作用中观察到丰富的 Mott-Wigner 物理学，但没有隧道耦合引起的电子态杂化确保了经典的层自由度。我们研究了 MoSe ₂同双层结构，其中层间相干隧穿允许电场控制操纵和测量基态空穴层赝自旋。我们在激子空穴散射中观察到电可调谐二维 Feshbach 共振，这使我们能够控制位于不同层的激子和空穴之间的相互作用强度。我们的结果可以实现具有可调相互作用的简并 Bose-Fermi 混合物。