Exciton-driven renormalization of quasiparticle band structure in monolayer MoS2

Yi Lin, Yang Hao Chan, Woojoo Lee, Li Syuan Lu, Zhenglu Li, Wen Hao Chang, Chih Kang Shih, Robert A. Kaindl, Steven G. Louie, Alessandra Lanzara

研究成果: Article同行評審

1 引文 斯高帕斯(Scopus)

摘要

Optical excitation serves as a powerful approach to control the electronic structure of layered van der Waals materials via many-body screening effects, induced by photoexcited free carriers, or via light-driven coherence, such as optical Stark and Bloch-Siegert effects. Although theoretical work has also pointed to an exotic mechanism of renormalizing band structure via excitonic correlations in bound electron-hole pairs (excitons), experimental observation of such exciton-driven band renormalization and the full extent of their implications is still lacking, largely due to the limitations of optical probes and the impact of screening effects. Here, by using extreme-ultraviolet time-resolved angle-resolved photoemission spectroscopy together with excitonic many-body theoretical calculations, we directly unmask the band renormalization effects driven by excitonic correlations in a monolayer semiconductor. We revealed a surprising bandgap opening, increased by 40 meV, and a simultaneous enhancement of band effective mass. Our findings unmask the exciton-driven mechanism toward the band engineering in photoexcited semiconducting materials, opening a playground to manipulate the transient energy states in layered quantum materials via optical controls of excitonic many-body correlations.

原文English
文章編號L081117
期刊Physical Review B
106
發行號8
DOIs
出版狀態Published - 15 8月 2022

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