Anisotropic Stark shift, field-induced dissociation, and electroabsorption of excitons in phosphorene
Autor(a) principal: | |
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Data de Publicação: | 2020 |
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/1822/68506 |
Resumo: | We compute binding energies, Stark shifts, electric-field-induced dissociation rates, and the Franz-Keldysh effect for excitons in phosphorene in various dielectric surroundings. All three effects show a pronounced dependence on the direction of the in-plane electric field with the dissociation rates, in particular, decreasing by several orders of magnitude upon rotating the electric field from the armchair to the zigzag axis. To better understand the numerical dissociation rates, we derive an analytical approximation to the anisotropic rates induced by weak electric fields thereby generalizing the previously obtained result for isotropic two-dimensional semiconductors. This approximation is shown to be valid in the weak-field limit by comparing it to the exact rates. The anisotropy is also apparent in the large difference between armchair and zigzag components of the exciton polarizability tensor, which we compute for the five lowest-lying states. As expected, we also find much more pronounced Stark shifts in either the armchair or the zigzag direction, depending on the symmetry of the state in question. Finally, an isotropic interaction potential is shown to be an excellent approximation to a more accurate anisotropic interaction derived from the Poisson equation, confirming that the anisotropy of phosphorene is largely due to the direction dependence of the effective masses. |
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Anisotropic Stark shift, field-induced dissociation, and electroabsorption of excitons in phosphoreneCiências Naturais::Ciências FísicasScience & TechnologyWe compute binding energies, Stark shifts, electric-field-induced dissociation rates, and the Franz-Keldysh effect for excitons in phosphorene in various dielectric surroundings. All three effects show a pronounced dependence on the direction of the in-plane electric field with the dissociation rates, in particular, decreasing by several orders of magnitude upon rotating the electric field from the armchair to the zigzag axis. To better understand the numerical dissociation rates, we derive an analytical approximation to the anisotropic rates induced by weak electric fields thereby generalizing the previously obtained result for isotropic two-dimensional semiconductors. This approximation is shown to be valid in the weak-field limit by comparing it to the exact rates. The anisotropy is also apparent in the large difference between armchair and zigzag components of the exciton polarizability tensor, which we compute for the five lowest-lying states. As expected, we also find much more pronounced Stark shifts in either the armchair or the zigzag direction, depending on the symmetry of the state in question. Finally, an isotropic interaction potential is shown to be an excellent approximation to a more accurate anisotropic interaction derived from the Poisson equation, confirming that the anisotropy of phosphorene is largely due to the direction dependence of the effective masses.EC - European Commission(881603); Center for Nanostructured Graphene (CNG), which is sponsored by the Danish National Research Foundation, Project No. DNRF103. Additionally, T.G.P. is supported by the QUSCOPE Center, sponsored by the Villum Foundation. N.M.R.P. acknowledges support from the European Commission through the project Graphene-Driven Revolutions in ICT and Beyond (Reference No. 785219) and the Portuguese Foundation for Science and Technology (FCT) in the framework of the Strategic Financing UID/FIS/04650/2019. In addition, N.M.R.P. acknowledges COMPETE2020, PORTUGAL2020, FEDER, and the FCT through Projects No. PTDC/FIS-NAN/3668/2013, No. POCI-01-0145- FEDER-028114, No. POCI-01-0145-FEDER-029265, No. PTDC/NAN-OPT/29265/2017, and No. POCI-01- 0145-FEDER-02888American Physical SocietyUniversidade do MinhoKamban, Høgni C.Pedersen, Thomas G.Peres, N. M. R.2020-092020-09-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/1822/68506engKamban, H. C., Pedersen, T. G., & Peres, N. M. (2020). Anisotropic Stark shift, field-induced dissociation, and electroabsorption of excitons in phosphorene. Physical Review B, 102(11), 1153052469-99502469-996910.1103/PhysRevB.102.115305https://journals.aps.org/prb/abstract/10.1103/PhysRevB.102.115305info: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:RCAAP2023-07-21T12:25:54Zoai:repositorium.sdum.uminho.pt:1822/68506Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T19:20:13.568289Repositório 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 |
Anisotropic Stark shift, field-induced dissociation, and electroabsorption of excitons in phosphorene |
title |
Anisotropic Stark shift, field-induced dissociation, and electroabsorption of excitons in phosphorene |
spellingShingle |
Anisotropic Stark shift, field-induced dissociation, and electroabsorption of excitons in phosphorene Kamban, Høgni C. Ciências Naturais::Ciências Físicas Science & Technology |
title_short |
Anisotropic Stark shift, field-induced dissociation, and electroabsorption of excitons in phosphorene |
title_full |
Anisotropic Stark shift, field-induced dissociation, and electroabsorption of excitons in phosphorene |
title_fullStr |
Anisotropic Stark shift, field-induced dissociation, and electroabsorption of excitons in phosphorene |
title_full_unstemmed |
Anisotropic Stark shift, field-induced dissociation, and electroabsorption of excitons in phosphorene |
title_sort |
Anisotropic Stark shift, field-induced dissociation, and electroabsorption of excitons in phosphorene |
author |
Kamban, Høgni C. |
author_facet |
Kamban, Høgni C. Pedersen, Thomas G. Peres, N. M. R. |
author_role |
author |
author2 |
Pedersen, Thomas G. Peres, N. M. R. |
author2_role |
author author |
dc.contributor.none.fl_str_mv |
Universidade do Minho |
dc.contributor.author.fl_str_mv |
Kamban, Høgni C. Pedersen, Thomas G. Peres, N. M. R. |
dc.subject.por.fl_str_mv |
Ciências Naturais::Ciências Físicas Science & Technology |
topic |
Ciências Naturais::Ciências Físicas Science & Technology |
description |
We compute binding energies, Stark shifts, electric-field-induced dissociation rates, and the Franz-Keldysh effect for excitons in phosphorene in various dielectric surroundings. All three effects show a pronounced dependence on the direction of the in-plane electric field with the dissociation rates, in particular, decreasing by several orders of magnitude upon rotating the electric field from the armchair to the zigzag axis. To better understand the numerical dissociation rates, we derive an analytical approximation to the anisotropic rates induced by weak electric fields thereby generalizing the previously obtained result for isotropic two-dimensional semiconductors. This approximation is shown to be valid in the weak-field limit by comparing it to the exact rates. The anisotropy is also apparent in the large difference between armchair and zigzag components of the exciton polarizability tensor, which we compute for the five lowest-lying states. As expected, we also find much more pronounced Stark shifts in either the armchair or the zigzag direction, depending on the symmetry of the state in question. Finally, an isotropic interaction potential is shown to be an excellent approximation to a more accurate anisotropic interaction derived from the Poisson equation, confirming that the anisotropy of phosphorene is largely due to the direction dependence of the effective masses. |
publishDate |
2020 |
dc.date.none.fl_str_mv |
2020-09 2020-09-01T00:00:00Z |
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/1822/68506 |
url |
http://hdl.handle.net/1822/68506 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Kamban, H. C., Pedersen, T. G., & Peres, N. M. (2020). Anisotropic Stark shift, field-induced dissociation, and electroabsorption of excitons in phosphorene. Physical Review B, 102(11), 115305 2469-9950 2469-9969 10.1103/PhysRevB.102.115305 https://journals.aps.org/prb/abstract/10.1103/PhysRevB.102.115305 |
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 |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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RCAAP |
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RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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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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1799132663869603840 |