TY - JOUR
T1 - Observation of phonon Stark effect
AU - Huang, Zhiheng
AU - Bai, Yunfei
AU - Zhao, Yanchong
AU - Liu, Le
AU - Zhao, Xuan
AU - Wu, Jiangbin
AU - Watanabe, Kenji
AU - Taniguchi, Takashi
AU - Yang, Wei
AU - Shi, Dongxia
AU - Xu, Yang
AU - Zhang, Tiantian
AU - Zhang, Qingming
AU - Tan, Ping Heng
AU - Sun, Zhipei
AU - Meng, Sheng
AU - Wang, Yaxian
AU - Du, Luojun
AU - Zhang, Guangyu
N1 - Publisher Copyright:
© The Author(s) 2024.
PY - 2024/12
Y1 - 2024/12
N2 - 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 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 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.
AB - 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 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 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.
UR - http://www.scopus.com/inward/record.url?scp=85194895220&partnerID=8YFLogxK
U2 - 10.1038/s41467-024-48992-w
DO - 10.1038/s41467-024-48992-w
M3 - Article
C2 - 38811589
AN - SCOPUS:85194895220
SN - 2041-1723
VL - 15
JO - Nature Communications
JF - Nature Communications
IS - 1
M1 - 4586
ER -