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説明:

Stark effect is one of the celebrated phenomena in modern physics and appealing for applications. While in condensed matter it has prospered only for excitons, whether other collective excitations can display Stark effect remains elusive. Here, we demonstrate the phonon Stark effect in a two-dimensional quantum system of bilayer 2H-MoS2. The longitudinal acoustic phonon red-shifts linearly with applied electric fields and can be tuned over ~ 1 THz, evidencing giant Stark effect of phonons. Together with many-body ab initio calculations, we uncover that the observed phonon Stark effect originates fundamentally from the strong coupling between phonons and interlayer excitons (IXs). In addition, IX-mediated electro-phonon intensity modulation up to ~ 1200% is discovered for infrared-active phonon A2u. Our results unveil the emerging phonon Stark effect and effective phonon engineering by IX-mediated mechanism, promising a plethora of many-body physics and potential technological innovations.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: Stark effect, phonons, bilayer 2H-MoS2

刊行年月日: 2024-05-29

出版者: Springer Science and Business Media LLC

掲載誌:

• Nature Communications (ISSN: 20411723) vol. 15 issue. 1 4586

研究助成金:

• the National Key R&D Program of China

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1038/s41467-024-48992-w

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更新時刻: 2025-02-07 16:30:30 +0900

MDRでの公開時刻: 2025-02-07 16:30:30 +0900