Tailoring the superposition of finite-momentum valley exciton states in transition-metal dichalcogenide monolayers by using polarized twisted light

Guan Hao Peng, Oscar Javier Gomez Sanchez, Wei Hua Li, Ping Yuan Lo, Shun Jen Cheng*

*此作品的通信作者

研究成果: Article同行評審

4 引文 斯高帕斯(Scopus)

摘要

A twisted light is a spatially structured light that carries quantized orbital angular momenta (OAM), being a new degree of freedom useful in quantum information technology in addition to that of intrinsic spin angular momentum (SAM), i.e., polarization. Using polarized twisted light to excite valley excitons in transition-metal dichalcogenide monolayers (TMD-ML's) sets up an intriguing photoexcited system which couples comprehensively the excitonic and photonic multi-degrees of freedom, including the center-of-mass motion and valley polarization of exciton and the both optical OAM and SAM. In this work, we present a systematic theoretical investigation of the photoexcited valley excitons in TMD-ML's by polarized Laguerre-Gaussian beams, one of the best known twisted light (TL). We show that the photoexcitation of polarized TL incident to a TMD-ML leads to the formation of the superposition of finite-momentum exciton (SFME) states, spatially localized with the OAM- and SAM-encoded geometrical patterns.

原文English
文章編號155304
期刊Physical Review B
106
發行號15
DOIs
出版狀態Published - 15 10月 2022

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