• 文献标题:   Ultrafast hot-carrier cooling in quasi freestanding bilayer graphene with hydrogen intercalated atoms
  • 文献类型:   Article
  • 作  者:   SHARMA S, MYERSWARD RL, GASKILL KD, CHATZAKIS I
  • 作者关键词:  
  • 出版物名称:   NANOSCALE ADVANCES
  • ISSN:   2516-0230
  • 通讯作者地址:  
  • 被引频次:   0
  • DOI:   10.1039/d2na00678b EA JAN 2023
  • 出版年:   2023

▎ 摘  要

Femtosecond-THz optical pump probe spectroscopy is employed to investigate the cooling dynamics of hot carriers in quasi-free standing bilayer epitaxial graphene with hydrogen interacalation. We observe longer decay time constants, in the range of 2.6 to 6.4 ps, compared to previous studies on monolayer graphene, which increase nonlinearly with excitation intensity. The increased relaxation times are due to the decoupling of the graphene layer from the SiC substrate after hydrogen intercalation which increases the distance between graphene and substrate. Furthermore, our measurements show that the supercollision mechanism is not related to the cooling process of the hot carriers, which is ultimately achieved by electron optical phonon scattering.