Cargando…
Ultrafast hot-carrier cooling in quasi freestanding bilayer graphene with hydrogen intercalated atoms
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 monol...
Autores principales: | , , , |
---|---|
Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
RSC
2023
|
Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9846464/ https://www.ncbi.nlm.nih.gov/pubmed/36756263 http://dx.doi.org/10.1039/d2na00678b |
_version_ | 1784871184260661248 |
---|---|
author | Sharma, Sachin Myers-Ward, Rachael L. Gaskill, Kurt D. Chatzakis, Ioannis |
author_facet | Sharma, Sachin Myers-Ward, Rachael L. Gaskill, Kurt D. Chatzakis, Ioannis |
author_sort | Sharma, Sachin |
collection | PubMed |
description | 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. |
format | Online Article Text |
id | pubmed-9846464 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2023 |
publisher | RSC |
record_format | MEDLINE/PubMed |
spelling | pubmed-98464642023-02-07 Ultrafast hot-carrier cooling in quasi freestanding bilayer graphene with hydrogen intercalated atoms Sharma, Sachin Myers-Ward, Rachael L. Gaskill, Kurt D. Chatzakis, Ioannis Nanoscale Adv Chemistry 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. RSC 2023-01-03 /pmc/articles/PMC9846464/ /pubmed/36756263 http://dx.doi.org/10.1039/d2na00678b Text en This journal is © The Royal Society of Chemistry https://creativecommons.org/licenses/by-nc/3.0/ |
spellingShingle | Chemistry Sharma, Sachin Myers-Ward, Rachael L. Gaskill, Kurt D. Chatzakis, Ioannis Ultrafast hot-carrier cooling in quasi freestanding bilayer graphene with hydrogen intercalated atoms |
title | Ultrafast hot-carrier cooling in quasi freestanding bilayer graphene with hydrogen intercalated atoms |
title_full | Ultrafast hot-carrier cooling in quasi freestanding bilayer graphene with hydrogen intercalated atoms |
title_fullStr | Ultrafast hot-carrier cooling in quasi freestanding bilayer graphene with hydrogen intercalated atoms |
title_full_unstemmed | Ultrafast hot-carrier cooling in quasi freestanding bilayer graphene with hydrogen intercalated atoms |
title_short | Ultrafast hot-carrier cooling in quasi freestanding bilayer graphene with hydrogen intercalated atoms |
title_sort | ultrafast hot-carrier cooling in quasi freestanding bilayer graphene with hydrogen intercalated atoms |
topic | Chemistry |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9846464/ https://www.ncbi.nlm.nih.gov/pubmed/36756263 http://dx.doi.org/10.1039/d2na00678b |
work_keys_str_mv | AT sharmasachin ultrafasthotcarriercoolinginquasifreestandingbilayergraphenewithhydrogenintercalatedatoms AT myerswardrachaell ultrafasthotcarriercoolinginquasifreestandingbilayergraphenewithhydrogenintercalatedatoms AT gaskillkurtd ultrafasthotcarriercoolinginquasifreestandingbilayergraphenewithhydrogenintercalatedatoms AT chatzakisioannis ultrafasthotcarriercoolinginquasifreestandingbilayergraphenewithhydrogenintercalatedatoms |