Polaron relaxation in a quantum dot due to anharmonic coupling within a mean-field approach
Autor(a) principal: | |
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Data de Publicação: | 2009 |
Outros Autores: | |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/1822/9835 |
Resumo: | We study the electronic relaxation in a quantum dot within the polaron approach by focusing on the reversible anharmonic decay of longitudinal optical LO phonons forming the polaron into longitudinalacoustic LA phonons. The coherent coupling between the LO and LA phonons is treated within a mean-field approach.We derive a temperature-dependent interlevel coupling parameter, related to the Grüneisen parameter and the thermal-expansion coefficient, which characterizes an effective decay channel for the electronic or excitonic states. Within this theory, we obtain a characteristic anharmonic decay time of 1 ns, 2–3 orders of magnitude longer than previous predictions based on the Fermi’s Golden Rule. We suggest that coherent relaxation due to carrier-carrier interaction is an efficient alternative to the (too slow) polaron decay. |
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Polaron relaxation in a quantum dot due to anharmonic coupling within a mean-field approachphononsexcitonsgallium arsenideGruneisen coefficientIII-V semiconductorsindium compoundspolaronssemiconductor quantum dotsthermal expansionScience & TechnologyWe study the electronic relaxation in a quantum dot within the polaron approach by focusing on the reversible anharmonic decay of longitudinal optical LO phonons forming the polaron into longitudinalacoustic LA phonons. The coherent coupling between the LO and LA phonons is treated within a mean-field approach.We derive a temperature-dependent interlevel coupling parameter, related to the Grüneisen parameter and the thermal-expansion coefficient, which characterizes an effective decay channel for the electronic or excitonic states. Within this theory, we obtain a characteristic anharmonic decay time of 1 ns, 2–3 orders of magnitude longer than previous predictions based on the Fermi’s Golden Rule. We suggest that coherent relaxation due to carrier-carrier interaction is an efficient alternative to the (too slow) polaron decay.Fundação para a Ciência e a Tecnologia (FCT) - PTDC/FIS/64404/2006; PTDC/FIS/72843/2006American Physical SocietyUniversidade do MinhoStauber, Tobias PascalVasilevskiy, Mikhail20092009-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/1822/9835engStauber, T., & Vasilevskiy, M. I. (2009). Polaron relaxation in a quantum dot due to anharmonic coupling within a mean-field approach. Physical Review B, 79(11), 113301. doi: 10.1103/PhysRevB.79.1133011098-01211550-235X10.1103/PhysRevB.79.113301info: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:RCAAP2023-07-21T12:23:47Zoai:repositorium.sdum.uminho.pt:1822/9835Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T19:17:36.914341Repositório 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 |
Polaron relaxation in a quantum dot due to anharmonic coupling within a mean-field approach |
title |
Polaron relaxation in a quantum dot due to anharmonic coupling within a mean-field approach |
spellingShingle |
Polaron relaxation in a quantum dot due to anharmonic coupling within a mean-field approach Stauber, Tobias Pascal phonons excitons gallium arsenide Gruneisen coefficient III-V semiconductors indium compounds polarons semiconductor quantum dots thermal expansion Science & Technology |
title_short |
Polaron relaxation in a quantum dot due to anharmonic coupling within a mean-field approach |
title_full |
Polaron relaxation in a quantum dot due to anharmonic coupling within a mean-field approach |
title_fullStr |
Polaron relaxation in a quantum dot due to anharmonic coupling within a mean-field approach |
title_full_unstemmed |
Polaron relaxation in a quantum dot due to anharmonic coupling within a mean-field approach |
title_sort |
Polaron relaxation in a quantum dot due to anharmonic coupling within a mean-field approach |
author |
Stauber, Tobias Pascal |
author_facet |
Stauber, Tobias Pascal Vasilevskiy, Mikhail |
author_role |
author |
author2 |
Vasilevskiy, Mikhail |
author2_role |
author |
dc.contributor.none.fl_str_mv |
Universidade do Minho |
dc.contributor.author.fl_str_mv |
Stauber, Tobias Pascal Vasilevskiy, Mikhail |
dc.subject.por.fl_str_mv |
phonons excitons gallium arsenide Gruneisen coefficient III-V semiconductors indium compounds polarons semiconductor quantum dots thermal expansion Science & Technology |
topic |
phonons excitons gallium arsenide Gruneisen coefficient III-V semiconductors indium compounds polarons semiconductor quantum dots thermal expansion Science & Technology |
description |
We study the electronic relaxation in a quantum dot within the polaron approach by focusing on the reversible anharmonic decay of longitudinal optical LO phonons forming the polaron into longitudinalacoustic LA phonons. The coherent coupling between the LO and LA phonons is treated within a mean-field approach.We derive a temperature-dependent interlevel coupling parameter, related to the Grüneisen parameter and the thermal-expansion coefficient, which characterizes an effective decay channel for the electronic or excitonic states. Within this theory, we obtain a characteristic anharmonic decay time of 1 ns, 2–3 orders of magnitude longer than previous predictions based on the Fermi’s Golden Rule. We suggest that coherent relaxation due to carrier-carrier interaction is an efficient alternative to the (too slow) polaron decay. |
publishDate |
2009 |
dc.date.none.fl_str_mv |
2009 2009-01-01T00:00:00Z |
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/1822/9835 |
url |
http://hdl.handle.net/1822/9835 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Stauber, T., & Vasilevskiy, M. I. (2009). Polaron relaxation in a quantum dot due to anharmonic coupling within a mean-field approach. Physical Review B, 79(11), 113301. doi: 10.1103/PhysRevB.79.113301 1098-0121 1550-235X 10.1103/PhysRevB.79.113301 |
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 |
American Physical Society |
publisher.none.fl_str_mv |
American Physical Society |
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 |
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1799132628659470336 |