Stronger Interlayer Interactions Contribute to Faster Hot Carrier Cooling of Bilayer Graphene under Pressure

We perform femtosecond pump-probe spectroscopy to in situ investigate the ultrafast photocarrier dynamics in bilayer graphene and observe an acceleration of energy relaxation under pressure. In combination with in situ Raman spectroscopy and ab initio molecular dynamics simulations, we reveal that i...

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Bibliographic Details
Published in:Physical review letters 2021-01, Vol.126 (2), p.027402-027402, Article 027402
Main Authors: Ni, Kun, Du, Jinxiang, Yang, Jin, Xu, Shujuan, Cong, Xin, Shu, Na, Zhang, Kai, Wang, Aolei, Wang, Fei, Ge, Liangbing, Zhao, Jin, Qu, Yan, Novoselov, Kostya S, Tan, Pingheng, Su, Fuhai, Zhu, Yanwu
Format: Article
Language:English
Subjects:
Bilayers
Coupling (molecular)
Graphene
Interlayers
Molecular dynamics
Raman spectroscopy
Spectrum analysis
Vibration mode
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Summary:We perform femtosecond pump-probe spectroscopy to in situ investigate the ultrafast photocarrier dynamics in bilayer graphene and observe an acceleration of energy relaxation under pressure. In combination with in situ Raman spectroscopy and ab initio molecular dynamics simulations, we reveal that interlayer shear and breathing modes have significant contributions to the faster hot-carrier relaxations by coupling with the in-plane vibration modes under pressure. Our work suggests that further understanding the effect of interlayer interaction on the behaviors of electrons and phonons would be critical to tailor the photocarrier dynamic properties of bilayer graphene.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.126.027402