Optical two-dimensional coherent spectroscopy of excitons in transition-metal dichalcogenides

Abstract

Exciton physics in atomically thin transition-metal dichalcogenides (TMDCs) holds paramount importance for fundamental physics research and prospective applications. However, the experimental exploration of exciton physics, including excitonic coherence dynamics, exciton many-body interactions, and their optical properties, faces challenges stemming from factors such as spatial heterogeneity and intricate many-body effects. In this perspective, we elaborate upon how optical two-dimensional coherent spectroscopy (2DCS) emerges as an effective tool to tackle the challenges, and outline potential directions for gaining deeper insights into exciton physics in forthcoming experiments with the advancements in 2DCS techniques and new materials.

Graphical abstract

Keywords

monolayer transition-metal dichalcogenides / two-dimensional coherent spectroscopy

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Declarations

The authors declare that they have no competing interests and there are no conflicts.

Acknowledgements

The authors thank Xiaoqin Li for her valuable discussions. S. Y. and X. L. acknowledge the support from the National Natural Science Foundation of China (Grant Nos. 12121004 and 12004391), the China Postdoctoral Science Foundation (Grants Nos. 2020T130682 and 2019M662752), the Science and Technology Department of Hubei Province (Grant No. 2020CFA029), and the Knowledge Innovation Program of Wuhan-Shuguang Project. T. J. acknowledges the support from the National Natural Science Foundation of China (Grant Nos. 62175188 and 62005198) and the Shanghai Science and Technology Innovation Action Plan Project (Grant No. 23ZR1465800). X. C. acknowledges support from the National Natural Science Foundation of China (Grant Nos. 61925504, 62020106009, and 6201101335), Science and Technology Commission of Shanghai Municipality (Grant Nos. 17JC1400800, 20JC1414600, and 21JC1406100), and the Special Development Funds for Major Projects of Shanghai Zhangjiang National Independent Innovation Demonstration Zone (Grant No. ZJ2021-ZD-008). D. H. acknowledges the support from the Fundamental Research Funds for the Central Universities.

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