Excitons in Bilayer MoS2 Displaying a Colossal Electric Field Splitting and Tunable Magnetic Response
Excitons in Bilayer MoS2 Displaying a Colossal Electric Field Splitting and Tunable Magnetic Response
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DOI：
10.1103/physrevlett.126.037401
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发表时间：
2021-01-20
影响因子：
8.6
通讯作者：
Hoefling, Sven
中科院分区：
文献类型：
--
作者：
Lorchat, Etienne;Selig, Malte;Hoefling, Sven
由过渡金属二硫属化物单层（TMDC）组成的货车德瓦耳斯异质结构的特征在于其真正丰富的激子性质，这由其结构、几何和电子性质决定：与纯单层相比，电子和空穴可以在不同的材料中托管，从而产生高度可调谐的偶极多粒子复合物。然而，对于真正的空间间接激子，偶极性质通常伴随着激子振子强度的显着淬灭。通过电场和磁场相关的测量，我们证明了一个稍微偏置的原始双层二硫化钼主机强偶极激子，保持了很强的振子强度。我们仔细研究了它们的巨大偶极矩，并通过偏置依赖的磁场测量进一步阐明了它们的轨道和谷物理学。
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 MoS2 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.