Jiang Ying, Chen Shula, Zheng Weihao, Zheng Biyuan, Pan Anlian
Key Laboratory for Micro-Nano Physics and Technology of Hunan Province, School of Physics and Electronics, and College of Materials Science and Engineering, Hunan University, Changsha, China.
Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, China.
Light Sci Appl. 2021 Apr 2;10(1):72. doi: 10.1038/s41377-021-00500-1.
Van der Waals (vdW) heterostructures based on transition metal dichalcogenides (TMDs) generally possess a type-II band alignment that facilitates the formation of interlayer excitons between constituent monolayers. Manipulation of the interlayer excitons in TMD vdW heterostructures holds great promise for the development of excitonic integrated circuits that serve as the counterpart of electronic integrated circuits, which allows the photons and excitons to transform into each other and thus bridges optical communication and signal processing at the integrated circuit. As a consequence, numerous studies have been carried out to obtain deep insight into the physical properties of interlayer excitons, including revealing their ultrafast formation, long population recombination lifetimes, and intriguing spin-valley dynamics. These outstanding properties ensure interlayer excitons with good transport characteristics, and may pave the way for their potential applications in efficient excitonic devices based on TMD vdW heterostructures. At present, a systematic and comprehensive overview of interlayer exciton formation, relaxation, transport, and potential applications is still lacking. In this review, we give a comprehensive description and discussion of these frontier topics for interlayer excitons in TMD vdW heterostructures to provide valuable guidance for researchers in this field.
基于过渡金属二硫属化物（TMD）的范德华（vdW）异质结构通常具有II型能带排列，这有利于在组成单层之间形成层间激子。对TMD vdW异质结构中层间激子的操控，对于开发作为电子集成电路对应物的激子集成电路具有巨大潜力，激子集成电路能使光子和激子相互转换，从而在集成电路层面架起光通信和信号处理之间的桥梁。因此，人们开展了大量研究，以深入了解层间激子的物理性质，包括揭示其超快形成、长的载流子复合寿命以及有趣的自旋谷动力学。这些优异特性确保了层间激子具有良好的输运特性，并可能为其在基于TMD vdW异质结构的高效激子器件中的潜在应用铺平道路。目前，仍然缺乏对层间激子形成、弛豫、输运及潜在应用的系统全面概述。在本综述中，我们对TMD vdW异质结构中层间激子的这些前沿课题进行了全面描述和讨论，为该领域的研究人员提供有价值的指导。
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