Tailoring excitonic states of van der Waals bilayers through stacking configuration, band alignment, and valley spin

Wei Ting Hsu, Bo Han Lin, Li Syuan Lu, Ming Hao Lee, Ming Wen Chu, Lain Jong Li, Wang Yao, Wen Hao Chang*, Chih Kang Shih

*此作品的通信作者

研究成果: Article同行評審

23 引文 斯高帕斯(Scopus)

摘要

Excitons in monolayer semiconductors have a large optical transition dipole for strong coupling with light. Interlayer excitons in heterobilayers feature a large electric dipole that enables strong coupling with an electric field and exciton-exciton interaction at the cost of a small optical dipole. We demonstrate the ability to create a new class of excitons in hetero- and homobilayers that combines advantages of monolayer and interlayer excitons, i.e., featuring both large optical and electric dipoles. These excitons consist of an electron confined in an individual layer, and a hole extended in both layers, where the carrier-species–dependent layer hybridization can be controlled through rotational, translational, band offset, and valley-spin degrees of freedom. We observe different species of layer-hybridized valley excitons, which can be used for realizing strongly interacting polaritonic gases and optical quantum controls of bidirectional interlayer carrier transfer.

原文English
文章編號eaax7407
期刊Science Advances
5
發行號12
DOIs
出版狀態Published - 20 十二月 2019

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