Author(s): Ni, K (Ni, Kun); Du, JX (Du, Jinxiang); Yang, J (Yang, Jin); Xu, SJ (Xu, Shujuan); Cong, X (Cong, Xin); Shu, N (Shu, Na); Zhang, K (Zhang, Kai); Wang, AL (Wang, Aolei); Wang, F (Wang, Fei); Ge, LB (Ge, Liangbing); Zhao, J (Zhao, Jin); Qu, Y (Qu, Yan); Novoselov, KS (Novoselov, Kostya S.); Tan, PH (Tan, Pingheng); Su, FH (Su, Fuhai); Zhu, YW (Zhu, Yanwu)

Source: PHYSICAL REVIEW LETTERS Volume: 126 Issue: 2 Article Number: 027402 DOI: 10.1103/PhysRevLett.126.027402 Published: JAN 13 2021

Abstract: 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.

Accession Number: WOS:000607525700018

PubMed ID: 33512233

ISSN: 0031-9007

eISSN: 1079-7114

Full Text: https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.126.027402