Ultrafast Hot-Carrier cooling in Quasi Freestanding Bilayer Graphene with Hydrogen Intercalated Atoms

Autor:	Sharma, Sachin, Myers-Ward, Rachael L., Gaskill, David Kurt, Chatzakis, Ioannis
Rok vydání:	2023
Předmět:	Condensed Matter - Mesoscale and Nanoscale Physics Condensed Matter - Materials Science J.2
Druh dokumentu:	Working Paper
DOI:	10.1039/d2na00678b
Popis:	We perform a femtosecond-THz optical pump-probe spectroscopy to investigate the cooling dynamics of hot carriers in quasi-free standing bilayer epitaxial graphene. We observed 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 do not show that the supercollision mechanism is related to the cooling process of the hot carriers, which is ultimately achieved by electron-optical phonon scattering. Comment: 19 pages in lauding the supplemental material. Tree figures and one more in the supplemental material. Nanoscale Advances 2023
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2302.00882 Zobrazit plný text záznamu View this record from Arxiv