Interlayer exciton laser of extended spatial coherence in atomically thin heterostructures
Interlayer exciton laser of extended spatial coherence in atomically thin heterostructures
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DOI：
10.1038/s41586-019-1779-x
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发表时间：
2019-12-05
期刊：
影响因子：
64.8
通讯作者：
Deng, Hui
中科院分区：
文献类型：
--
作者：
Paik, Eunice Y.;Zhang, Long;Deng, Hui
二维半导体由于其强激子-光子相互作用（1，2）以及其被工程化和集成到器件中的能力（3）而成为纳米光子学的一类新材料。在这里，我们利用这些特性来设计一种基于旋转排列的原子薄异质结构中的直接带隙层间激子的高效激光介质（4）。激光测量从过渡金属二硫属化物异质双层（WSe 2-MoSe 2）集成在氮化硅光栅谐振器。在超过激光阈值时，观察到发射的空间相干性突然增加。这项工作建立了层间激子在二维异质结构作为增益介质的空间相干激光发射和异质集成的潜力。由于电可调激子-光子相互作用强度（5）和长程偶极相互作用，这些层间激子有望用作低功率超快激光器和调制器，并用于研究多体量子现象（6）。
Two-dimensional semiconductors have emerged as a new class of materials for nanophotonics owing to their strong exciton-photon interaction(1,2) and their ability to be engineered and integrated into devices(3). Here we take advantage of these properties to engineer an efficient lasing medium based on direct-bandgap interlayer excitons in rotationally aligned atomically thin heterostructures(4). Lasing is measured from a transition-metal dichalcogenide heterobilayer (WSe2-MoSe2) integrated in a silicon nitride grating resonator. An abrupt increase in the spatial coherence of the emission is observed acrossthe lasing threshold. The work establishes interlayer excitons in two-dimensional heterostructures as a gain medium with spatially coherent lasing emission and potential for heterogeneous integration. With electrically tunable exciton-photon interaction strengths(5) and long-range dipolar interactions, these interlayer excitons are promising for application as low-power, ultrafast lasers and modulators and for the study of many-body quantum phenomena(6).