论文标题
Moiré的理论局部激子在过渡金属二甲基元化杂化剂中
Theory of moiré localized excitons in transition-metal dichalcogenide heterobilayers
论文作者
论文摘要
过渡金属二甲基元化的异质结构表现出Moiré模式，可空间调节材料平面上的电子结构。对于某些材料对，该调制充当潜在的景观，具有深层的，三角形的对称井，能够定位层间激子，形成量子发射器的定期阵列。在这里，我们研究了这些Moiré局部的激子状态及其光学特性。通过数值求解由三角电势限制的相互作用电子孔对的两体问题，我们计算了不同材料对的局部激子光谱。我们为局部状态的不同家族提供了光学选择规则，每个家族都属于电势对称组$ c_ {3v} $的不可约的表示之一，并在数值上估计其极化分辨的吸收光谱。我们发现，局部MoiréInterlayer激子的光学响应主要由属于双重成分$ e $ e $不可征用的州所主导。我们的结果为二维半导体中人为限制的激子的光学特性提供了新的见解。
Transition-metal dichalcogenide heterostructures exhibit moiré patterns that spatially modulate the electronic structure across the material's plane. For certain material pairs, this modulation acts as a potential landscape with deep, trigonally symmetric wells capable of localizing interlayer excitons, forming periodic arrays of quantum emitters. Here, we study these moiré localized exciton states and their optical properties. By numerically solving the two-body problem for an interacting electron-hole pair confined by a trigonal potential, we compute the localized exciton spectra for different pairs of materials. We derive optical selection rules for the different families of localized states, each belonging to one of the irreducible representations of the potential's symmetry group $C_{3v}$, and numerically estimate their polarization-resolved absorption spectra. We find that the optical response of localized moiré interlayer excitons is dominated by states belonging to the doubly-degenerate $E$ irreducible representation. Our results provide new insights into the optical properties of artificially confined excitons in two-dimensional semiconductors.
