期刊
NANO LETTERS
卷 14, 期 10, 页码 5621-5624出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl502163d
关键词
Supercollision; electron dynamics; two-dimensional crystal; defects; graphene
类别
资金
- Capes
- CNPq
- FAPEMIG
- INCT Carbon Nanomaterials-MCT, Brazil
Defects play a fundamental role in the energy relaxation of hot photoexcited carriers in graphene, thus a complete understanding of these processes are vital for improving the development of graphene devices. Recently, it has been theoretically predicted and experimentally demonstrated that defect-assisted acoustic phonon supercollision, the collision between a carrier and both an acoustic phonon and a defect, is an important energy relaxation process for carriers with excess energy below the optical phonon emission. Here, we studied samples with defects optically generated in a controlled manner to experimentally probe the supercollision model as a function of the defect density. We present pump and probe transient absorption measurements showing that the decay time decreases as the density of defect increases as predicted by the supercollision model.
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