Observation of phonon Stark effect

Stark effect, the electric-field analogue of magnetic Zeeman effect, is one of the celebrated phenomena in modern physics and appealing for emergent applications in electronics, optoelectronics, as well as quantum technologies. While in condensed matter it has prospered only for excitons, whether ot...

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Published in:Nature communications 2024-05, Vol.15 (1), p.4586-9, Article 4586
Main Authors: Huang, Zhiheng, Bai, Yunfei, Zhao, Yanchong, Liu, Le, Zhao, Xuan, Wu, Jiangbin, Watanabe, Kenji, Taniguchi, Takashi, Yang, Wei, Shi, Dongxia, Xu, Yang, Zhang, Tiantian, Zhang, Qingming, Tan, Ping-Heng, Sun, Zhipei, Meng, Sheng, Wang, Yaxian, Du, Luojun, Zhang, Guangyu
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119/118
140/133
639/301
639/766/119
Acoustics
Electric fields
Electrons
Excitons
Graphene
Humanities and Social Sciences
Interlayers
Laboratories
Materials science
Molybdenum disulfide
multidisciplinary
Optoelectronics
Phonons
Physics
Quantum dots
Quantum theory
Science
Science (multidisciplinary)
Spectrum analysis
Stark effect
Technological change
Theoretical physics
Zeeman effect
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creator Huang, Zhiheng
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Zhao, Yanchong
Liu, Le
Zhao, Xuan
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Yang, Wei
Shi, Dongxia
Xu, Yang
Zhang, Tiantian
Zhang, Qingming
Tan, Ping-Heng
Sun, Zhipei
Meng, Sheng
Wang, Yaxian
Du, Luojun
Zhang, Guangyu
description Stark effect, the electric-field analogue of magnetic Zeeman effect, is one of the celebrated phenomena in modern physics and appealing for emergent applications in electronics, optoelectronics, as well as quantum technologies. While in condensed matter it has prospered only for excitons, whether other collective excitations can display Stark effect remains elusive. Here, we report the observation of phonon Stark effect in a two-dimensional quantum system of bilayer 2 H -MoS 2 . 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 A 2u . Our results unveil the exotic phonon Stark effect and effective phonon engineering by IX-mediated mechanism, promising for a plethora of exciting many-body physics and potential technological innovations. The authors report experimental evidence of phonon Stark effect in 2 H -MoS 2 bilayers. A Stark phonon appears as the interlayer excitons are tuned to resonate with the LA phonon emission line, and shows a linear energy shift upon application of an out-of-plane electric field.
doi_str_mv 10.1038/s41467-024-48992-w
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subjects 119/118
140/133
639/301
639/766/119
Acoustics
Electric fields
Electrons
Excitons
Graphene
Humanities and Social Sciences
Interlayers
Laboratories
Materials science
Molybdenum disulfide
multidisciplinary
Optoelectronics
Phonons
Physics
Quantum dots
Quantum theory
Science
Science (multidisciplinary)
Spectrum analysis
Stark effect
Technological change
Theoretical physics
Zeeman effect
title Observation of phonon Stark effect
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