发表机构
Laboratoire de Physique des Matériaux, Faculté des Sciences de Bizerte, Université de Carthage（迦太基大学比塞大科学学院材料物理实验室）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究理论探究静电掺杂对WSe2/扭转双层石墨烯异质结构激子光学响应的影响，揭示掺杂诱导的莫尔超晶格势调制激子光谱，产生卫星共振，为光学传感器设计提供新途径。
AI 中文摘要
我们理论上研究了垂直堆叠在扭转双层石墨烯（tBG）上的WSe2单层在静电掺杂下的光学响应。在该异质结构中，掺杂的tBG莫尔超晶格产生空间调制的静电势，该电势通过屏蔽库仑相互作用耦合到WSe2激子的电子和空穴组分，从而为激子耦合到莫尔费米海的电荷密度景观提供了微观机制。聚焦于魔角（1.1°）以下的扭转角，其中电子关联显著增强，我们证明静电掺杂诱导激子吸收光谱的显著变化，包括多个卫星共振的出现。我们表明这些光谱特征源于激子质心与内部自由度之间的相互作用，以及掺杂诱导的不同轨道对称性里德伯激子态之间的杂化。计算的光谱与先前报道的实验观察和理论预测高度一致。我们的结果确立了tBG中的静电掺杂作为调控相邻半导体单层中激子态的有效手段，并为新型光学传感器器件提供了途径。
英文摘要
We theoretically investigate the optical response of the WSe2 monolayer vertically stacked on twisted bilayer graphene (tBG) under electrostatic doping. In this heterostructure, the doped moiré superlattice of tBG generates a spatially modulated electrostatic potential that couples to the electron and hole constituents of the WSe2 exciton through the screened Coulomb interaction, thereby providing a microscopic mechanism for exciton coupling to the charge-density landscape of the moiré Fermi sea. Focusing on twist angles below the magic angle (1.1°), where electronic correlations are strongly enhanced, we demonstrate that electrostatic doping induces pronounced modifications of the excitonic absorption spectrum, including the emergence of multiple satellite resonances. We show that these spectral features originate from the interplay between the exciton center-of-mass and internal degrees of freedom, together with doping-induced hybridization between Rydberg exciton states of different orbital symmetry. The calculated spectra are in good agreement with previously reported experimental observations and theoretical predictions. Our results establish electrostatic doping in tBG as an effective means of engineering excitonic states in adjacent semiconducting monolayers and provide a pathway toward novel optical sensor devices.
