van der Waals heterostructures composed of transition metal dichalcogenide monolayers (TMDCs) are characterized by their truly rich excitonic properties which are determined by their structural, geometric, and electronic properties: In contrast to pure monolayers, electrons and holes can be hosted in different materials, resulting in highly tunable dipolar many-particle complexes. However, for genuine spatially indirect excitons, the dipolar nature is usually accompanied by a notable quenching of the exciton oscillator strength. Via electric and magnetic field dependent measurements, we demonstrate that a slightly biased pristine bilayer ${\mathrm{MoS}}_2$ hosts strongly dipolar excitons, which preserve a strong oscillator strength. We scrutinize their giant dipole moment, and shed further light on their orbital and valley physics via bias-dependent magnetic field measurements.

中文翻译：

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BilayerMoS2中的激子显示巨大的电场分裂和可调的磁响应

由过渡金属二硫化氢单分子层（TMDC）组成的范德华异质结构的特征是其真正丰富的激子性质，这由其结构，几何和电子性质决定：与纯单层相反，电子和空穴可以包含在不同的材料中，导致高度可调的偶极多粒子复合物。但是，对于真正的空间间接激子，偶极性质通常伴随着激子振荡器强度的明显猝灭。通过与电场和磁场有关的测量，我们证明了稍微偏斜的原始双层${\mathrm{硫化钼}}_2$拥有强烈的偶极激子，可保持强大的振荡器强度。我们仔细研究了它们的巨大偶极矩，并通过与偏倚有关的磁场测量进一步阐明了它们的轨道和谷地物理特性。