Observation of intra- and inter-band transitions in the optical response of graphene

Detalhes bibliográficos
Autor(a) principal: Malard, Leandro M.
Data de Publicação: 2013
Outros Autores: Mak, Kin Fai, Castro Neto, A. H., Peres, N. M. R., Heinz, Tony F.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/1822/24611
Resumo: The optical conductivity of freely suspended graphene was examined under non-equilibrium conditions using femtosecond pump-probe spectroscopy. We observed a conductivity transient that varied strongly with the electronic temperature, exhibiting a crossover from enhanced to decreased absorbance with increasing pump fluence. The response arises from a combination of bleaching of the inter-band transitions by Pauli blocking and induced absorption from the intra-band transitions of the carriers. The latter dominates at low electronic temperature, but, despite an increase in Drude scattering rate, is overwhelmed by the former at high electronic temperature. The time-evolution of the optical conductivity in all regimes can described in terms of a time-varying electronic temperature.
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spelling Observation of intra- and inter-band transitions in the optical response of grapheneGrapheneOpticalScience & TechnologyThe optical conductivity of freely suspended graphene was examined under non-equilibrium conditions using femtosecond pump-probe spectroscopy. We observed a conductivity transient that varied strongly with the electronic temperature, exhibiting a crossover from enhanced to decreased absorbance with increasing pump fluence. The response arises from a combination of bleaching of the inter-band transitions by Pauli blocking and induced absorption from the intra-band transitions of the carriers. The latter dominates at low electronic temperature, but, despite an increase in Drude scattering rate, is overwhelmed by the former at high electronic temperature. The time-evolution of the optical conductivity in all regimes can described in terms of a time-varying electronic temperature.We thank Dr Y Wu, Dr M Koshino, Dr D Song, and Dr H Yan for fruitful discussions and C H Lui for sample preparation. We acknowledge support from the MURI program of the Air Force Office of Scientific Research (Arlington, VA, USA) and from the National Science Foundation under grant numbers DMR-1124894 and DMR-1106225. AHCN acknowledges partial support from the US DOE under grant no. DE-FG02-08ER46512 and from the Office of Naval Research (ONR) under MURI grant no. N00014-09-1-1063. LM acknowledges support from the Conselho Nacional de Pesquisa (CNPq) program in Brazil.IOP Publishing LtdUniversidade do MinhoMalard, Leandro M.Mak, Kin FaiCastro Neto, A. H.Peres, N. M. R.Heinz, Tony F.20132013-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/1822/24611engNew Journal of Physics1367-263010.1088/1367-2630/15/1/015009http://iopscience.iop.org/1367-2630/15/1/015009/pdf/1367-2630_15_1_015009.pdfinfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-07-21T12:48:47Zoai:repositorium.sdum.uminho.pt:1822/24611Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T19:47:07.101803Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv Observation of intra- and inter-band transitions in the optical response of graphene
title Observation of intra- and inter-band transitions in the optical response of graphene
spellingShingle Observation of intra- and inter-band transitions in the optical response of graphene
Malard, Leandro M.
Graphene
Optical
Science & Technology
title_short Observation of intra- and inter-band transitions in the optical response of graphene
title_full Observation of intra- and inter-band transitions in the optical response of graphene
title_fullStr Observation of intra- and inter-band transitions in the optical response of graphene
title_full_unstemmed Observation of intra- and inter-band transitions in the optical response of graphene
title_sort Observation of intra- and inter-band transitions in the optical response of graphene
author Malard, Leandro M.
author_facet Malard, Leandro M.
Mak, Kin Fai
Castro Neto, A. H.
Peres, N. M. R.
Heinz, Tony F.
author_role author
author2 Mak, Kin Fai
Castro Neto, A. H.
Peres, N. M. R.
Heinz, Tony F.
author2_role author
author
author
author
dc.contributor.none.fl_str_mv Universidade do Minho
dc.contributor.author.fl_str_mv Malard, Leandro M.
Mak, Kin Fai
Castro Neto, A. H.
Peres, N. M. R.
Heinz, Tony F.
dc.subject.por.fl_str_mv Graphene
Optical
Science & Technology
topic Graphene
Optical
Science & Technology
description The optical conductivity of freely suspended graphene was examined under non-equilibrium conditions using femtosecond pump-probe spectroscopy. We observed a conductivity transient that varied strongly with the electronic temperature, exhibiting a crossover from enhanced to decreased absorbance with increasing pump fluence. The response arises from a combination of bleaching of the inter-band transitions by Pauli blocking and induced absorption from the intra-band transitions of the carriers. The latter dominates at low electronic temperature, but, despite an increase in Drude scattering rate, is overwhelmed by the former at high electronic temperature. The time-evolution of the optical conductivity in all regimes can described in terms of a time-varying electronic temperature.
publishDate 2013
dc.date.none.fl_str_mv 2013
2013-01-01T00:00:00Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/1822/24611
url http://hdl.handle.net/1822/24611
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv New Journal of Physics
1367-2630
10.1088/1367-2630/15/1/015009
http://iopscience.iop.org/1367-2630/15/1/015009/pdf/1367-2630_15_1_015009.pdf
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv IOP Publishing Ltd
publisher.none.fl_str_mv IOP Publishing Ltd
dc.source.none.fl_str_mv reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron:RCAAP
instname_str Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron_str RCAAP
institution RCAAP
reponame_str Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
collection Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
repository.name.fl_str_mv Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
repository.mail.fl_str_mv
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