Spin dynamics in bilayer graphene

We report on spin transport features which are unique to high quality bilayer graphene, in the absence of magnetic contaminants and strong intervalley mixing. The time-dependent spin polarization of a propagating wave packet is computed using an efficient quantum transport method. In the limit of va...

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Autores: Dinh, Van Tuan|||0000-0002-9605-2686, Adam, Shaffique, Roche, Stephan|||0000-0003-0323-4665
Tipo de recurso: artículo
Fecha de publicación:2016
País:España
Institución:Universitat Autònoma de Barcelona
Repositorio:Dipòsit Digital de Documents de la UAB
Idioma:inglés
OAI Identifier:oai:ddd.uab.cat:195651
Acceso en línea:https://ddd.uab.cat/record/195651
https://dx.doi.org/urn:doi:10.1103/PhysRevB.94.041405
Access Level:acceso abierto
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spelling Spin dynamics in bilayer grapheneRole of electron-hole puddles and Dyakonov-Perel mechanismDinh, Van Tuan|||0000-0002-9605-2686Adam, ShaffiqueRoche, Stephan|||0000-0003-0323-4665We report on spin transport features which are unique to high quality bilayer graphene, in the absence of magnetic contaminants and strong intervalley mixing. The time-dependent spin polarization of a propagating wave packet is computed using an efficient quantum transport method. In the limit of vanishing effects of substrate and disorder, the energy dependence of the spin lifetime is similar to monolayer graphene with an M-shaped profile and minimum value at the charge neutrality point, but with an electron-hole asymmetry fingerprint. In sharp contrast, the incorporation of substrate-induced electron-hole puddles (characteristics of supported graphene either on SiO2 or hBN) surprisingly results in a large enhancement of the low-energy spin lifetime and a lowering of its high-energy values. Such a feature, unique to the bilayer, is explained in terms of a reinforced Dyakonov-Perel mechanism at the Dirac point, whereas spin relaxation at higher energies is driven by pure dephasing effects. This suggests further electrostatic control of the spin transport length scales in graphene devices. 22016-01-0120162016-01-01Articlehttp://purl.org/coar/resource_type/c_6501AMhttp://purl.org/coar/version/c_ab4af688f83e57aainfo:eu-repo/semantics/articleapplication/pdfhttps://ddd.uab.cat/record/195651https://dx.doi.org/urn:doi:10.1103/PhysRevB.94.041405reponame:Dipòsit Digital de Documents de la UABinstname:Universitat Autònoma de BarcelonaInglésengEuropean Commission https://doi.org/10.13039/501100000780 696656Ministerio de Economía y Competitividad https://doi.org/10.13039/501100003329 FIS2015-67767-PMinisterio de Economía y Competitividad https://doi.org/10.13039/501100003329 SEV-2013-0295open accesshttp://purl.org/coar/access_right/c_abf2Aquest material està protegit per drets d'autor i/o drets afins. Podeu utilitzar aquest material en funció del que permet la legislació de drets d'autor i drets afins d'aplicació al vostre cas. Per a d'altres usos heu d'obtenir permís del(s) titular(s) de drets.https://rightsstatements.org/vocab/InC/1.0/info:eu-repo/semantics/openAccessoai:ddd.uab.cat:1956512026-06-06T12:50:31Z
dc.title.none.fl_str_mv Spin dynamics in bilayer graphene
Role of electron-hole puddles and Dyakonov-Perel mechanism
title Spin dynamics in bilayer graphene
spellingShingle Spin dynamics in bilayer graphene
Dinh, Van Tuan|||0000-0002-9605-2686
title_short Spin dynamics in bilayer graphene
title_full Spin dynamics in bilayer graphene
title_fullStr Spin dynamics in bilayer graphene
title_full_unstemmed Spin dynamics in bilayer graphene
title_sort Spin dynamics in bilayer graphene
dc.creator.none.fl_str_mv Dinh, Van Tuan|||0000-0002-9605-2686
Adam, Shaffique
Roche, Stephan|||0000-0003-0323-4665
author Dinh, Van Tuan|||0000-0002-9605-2686
author_facet Dinh, Van Tuan|||0000-0002-9605-2686
Adam, Shaffique
Roche, Stephan|||0000-0003-0323-4665
author_role author
author2 Adam, Shaffique
Roche, Stephan|||0000-0003-0323-4665
author2_role author
author
description We report on spin transport features which are unique to high quality bilayer graphene, in the absence of magnetic contaminants and strong intervalley mixing. The time-dependent spin polarization of a propagating wave packet is computed using an efficient quantum transport method. In the limit of vanishing effects of substrate and disorder, the energy dependence of the spin lifetime is similar to monolayer graphene with an M-shaped profile and minimum value at the charge neutrality point, but with an electron-hole asymmetry fingerprint. In sharp contrast, the incorporation of substrate-induced electron-hole puddles (characteristics of supported graphene either on SiO2 or hBN) surprisingly results in a large enhancement of the low-energy spin lifetime and a lowering of its high-energy values. Such a feature, unique to the bilayer, is explained in terms of a reinforced Dyakonov-Perel mechanism at the Dirac point, whereas spin relaxation at higher energies is driven by pure dephasing effects. This suggests further electrostatic control of the spin transport length scales in graphene devices.
publishDate 2016
dc.date.none.fl_str_mv 2
2016-01-01
2016
2016-01-01
dc.type.none.fl_str_mv Article
http://purl.org/coar/resource_type/c_6501
AM
http://purl.org/coar/version/c_ab4af688f83e57aa
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
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dc.identifier.none.fl_str_mv https://ddd.uab.cat/record/195651
https://dx.doi.org/urn:doi:10.1103/PhysRevB.94.041405
url https://ddd.uab.cat/record/195651
https://dx.doi.org/urn:doi:10.1103/PhysRevB.94.041405
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.relation.none.fl_str_mv European Commission https://doi.org/10.13039/501100000780 696656
Ministerio de Economía y Competitividad https://doi.org/10.13039/501100003329 FIS2015-67767-P
Ministerio de Economía y Competitividad https://doi.org/10.13039/501100003329 SEV-2013-0295
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
https://rightsstatements.org/vocab/InC/1.0/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
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eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:Dipòsit Digital de Documents de la UAB
instname:Universitat Autònoma de Barcelona
instname_str Universitat Autònoma de Barcelona
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collection Dipòsit Digital de Documents de la UAB
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