Article Observation of phonon Stark effect

Zhiheng Huang ; Yunfei Bai ; Yanchong Zhao ; Le Liu ; Xuan Zhao ; Jiangbin Wu ; Kenji Watanabe SAMURAI ORCID (National Institute for Materials Science) ; Takashi Taniguchi SAMURAI ORCID (National Institute for Materials Science) ; Wei Yang ; Dongxia Shi ; Yang Xu ; Tiantian Zhang ; Qingming Zhang ; Ping-Heng Tan ; Zhipei Sun ; Sheng Meng ; Yaxian Wang ; Luojun Du ; Guangyu Zhang

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Zhiheng Huang, Yunfei Bai, Yanchong Zhao, Le Liu, Xuan Zhao, Jiangbin Wu, Kenji Watanabe, Takashi Taniguchi, Wei Yang, Dongxia Shi, Yang Xu, Tiantian Zhang, Qingming Zhang, Ping-Heng Tan, Zhipei Sun, Sheng Meng, Yaxian Wang, Luojun Du, Guangyu Zhang. Observation of phonon Stark effect. Nature Communications. 2024, 15 (1), 4586. https://doi.org/10.1038/s41467-024-48992-w

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(abstract)

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.

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Keyword: Stark effect, phonons, bilayer 2H-MoS2

Date published: 2024-05-29

Publisher: Springer Science and Business Media LLC

Journal:

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

Funding:

  • the National Key R&D Program of China

Manuscript type: Publisher's version (Version of record)

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

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Updated at: 2025-02-07 16:30:30 +0900

Published on MDR: 2025-02-07 16:30:30 +0900

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