Quantum Confinement of Dirac Quasiparticles in Graphene Patterned with Sub-Nanometer Precision

Quantum confinement of graphene Dirac-like electrons in artificially crafted nanometer structures is a long sought goal that would provide a strategy to selectively tune the electronic properties of graphene, including bandgap opening or quantization of energy levels. However, creating confining str...

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Autores: Cortés del Río, Eva, Mallet, Pierre, González Herrero, Héctor, Lado, José Luis, Fernández-Rossier, J., Gómez-Rodríguez, José M., Veuillen, Jean Yves
Formato: artículo
Fecha de publicación:2020
País:España
Recursos:Universidad Autónoma de Madrid
Repositorio:Biblos-e Archivo. Repositorio Institucional de la UAM
Idioma:inglés
OAI Identifier:oai:repositorio.uam.es:10486/709105
Acesso em linha:http://hdl.handle.net/10486/709105
https://dx.doi.org/10.1002/adma.202001119
Access Level:acceso abierto
Palavra-chave:atomic manipulation
graphene
graphene quantum dots
nanopatterning
scanning tunneling microscopy
Física
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spelling Quantum Confinement of Dirac Quasiparticles in Graphene Patterned with Sub-Nanometer PrecisionCortés del Río, EvaMallet, PierreGonzález Herrero, HéctorLado, José LuisFernández-Rossier, J.Gómez-Rodríguez, José M.Veuillen, Jean Yvesatomic manipulationgraphenegraphene quantum dotsnanopatterningscanning tunneling microscopyFísicaQuantum confinement of graphene Dirac-like electrons in artificially crafted nanometer structures is a long sought goal that would provide a strategy to selectively tune the electronic properties of graphene, including bandgap opening or quantization of energy levels. However, creating confining structures with nanometer precision in shape, size, and location remains an experimental challenge, both for top-down and bottom-up approaches. Moreover, Klein tunneling, offering an escape route to graphene electrons, limits the efficiency of electrostatic confinement. Here, a scanning tunneling microscope (STM) is used to create graphene nanopatterns, with sub-nanometer precision, by the collective manipulation of a large number of H atoms. Individual graphene nanostructures are built at selected locations, with predetermined orientations and shapes, and with dimensions going all the way from 2 nm up to 1 µm. The method permits the patterns to be erased and rebuilt at will, and it can be implemented on different graphene substrates. STM experiments demonstrate that such graphene nanostructures confine very efficiently graphene Dirac quasiparticles, both in 0D and 1D structures. In graphene quantum dots, perfectly defined energy bandgaps up to 0.8 eV are found that scale as the inverse of the dot’s linear dimension, as expected for massless Dirac fermionWiley-VCH VerlagDepartamento de Física de la Materia CondensadaFacultad de Ciencias20202020-07-29research articlehttp://purl.org/coar/resource_type/c_2df8fbb1AMhttp://purl.org/coar/version/c_ab4af688f83e57aainfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10486/709105https://dx.doi.org/10.1002/adma.202001119reponame:Biblos-e Archivo. Repositorio Institucional de la UAMinstname:Universidad Autónoma de MadridInglésengopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:repositorio.uam.es:10486/7091052026-06-23T12:46:27Z
dc.title.none.fl_str_mv Quantum Confinement of Dirac Quasiparticles in Graphene Patterned with Sub-Nanometer Precision
title Quantum Confinement of Dirac Quasiparticles in Graphene Patterned with Sub-Nanometer Precision
spellingShingle Quantum Confinement of Dirac Quasiparticles in Graphene Patterned with Sub-Nanometer Precision
Cortés del Río, Eva
atomic manipulation
graphene
graphene quantum dots
nanopatterning
scanning tunneling microscopy
Física
title_short Quantum Confinement of Dirac Quasiparticles in Graphene Patterned with Sub-Nanometer Precision
title_full Quantum Confinement of Dirac Quasiparticles in Graphene Patterned with Sub-Nanometer Precision
title_fullStr Quantum Confinement of Dirac Quasiparticles in Graphene Patterned with Sub-Nanometer Precision
title_full_unstemmed Quantum Confinement of Dirac Quasiparticles in Graphene Patterned with Sub-Nanometer Precision
title_sort Quantum Confinement of Dirac Quasiparticles in Graphene Patterned with Sub-Nanometer Precision
dc.creator.none.fl_str_mv Cortés del Río, Eva
Mallet, Pierre
González Herrero, Héctor
Lado, José Luis
Fernández-Rossier, J.
Gómez-Rodríguez, José M.
Veuillen, Jean Yves
author Cortés del Río, Eva
author_facet Cortés del Río, Eva
Mallet, Pierre
González Herrero, Héctor
Lado, José Luis
Fernández-Rossier, J.
Gómez-Rodríguez, José M.
Veuillen, Jean Yves
author_role author
author2 Mallet, Pierre
González Herrero, Héctor
Lado, José Luis
Fernández-Rossier, J.
Gómez-Rodríguez, José M.
Veuillen, Jean Yves
author2_role author
author
author
author
author
author
dc.contributor.none.fl_str_mv Departamento de Física de la Materia Condensada
Facultad de Ciencias
dc.subject.none.fl_str_mv atomic manipulation
graphene
graphene quantum dots
nanopatterning
scanning tunneling microscopy
Física
topic atomic manipulation
graphene
graphene quantum dots
nanopatterning
scanning tunneling microscopy
Física
description Quantum confinement of graphene Dirac-like electrons in artificially crafted nanometer structures is a long sought goal that would provide a strategy to selectively tune the electronic properties of graphene, including bandgap opening or quantization of energy levels. However, creating confining structures with nanometer precision in shape, size, and location remains an experimental challenge, both for top-down and bottom-up approaches. Moreover, Klein tunneling, offering an escape route to graphene electrons, limits the efficiency of electrostatic confinement. Here, a scanning tunneling microscope (STM) is used to create graphene nanopatterns, with sub-nanometer precision, by the collective manipulation of a large number of H atoms. Individual graphene nanostructures are built at selected locations, with predetermined orientations and shapes, and with dimensions going all the way from 2 nm up to 1 µm. The method permits the patterns to be erased and rebuilt at will, and it can be implemented on different graphene substrates. STM experiments demonstrate that such graphene nanostructures confine very efficiently graphene Dirac quasiparticles, both in 0D and 1D structures. In graphene quantum dots, perfectly defined energy bandgaps up to 0.8 eV are found that scale as the inverse of the dot’s linear dimension, as expected for massless Dirac fermion
publishDate 2020
dc.date.none.fl_str_mv 2020
2020-07-29
dc.type.none.fl_str_mv research article
http://purl.org/coar/resource_type/c_2df8fbb1
AM
http://purl.org/coar/version/c_ab4af688f83e57aa
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10486/709105
https://dx.doi.org/10.1002/adma.202001119
url http://hdl.handle.net/10486/709105
https://dx.doi.org/10.1002/adma.202001119
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Wiley-VCH Verlag
publisher.none.fl_str_mv Wiley-VCH Verlag
dc.source.none.fl_str_mv reponame:Biblos-e Archivo. Repositorio Institucional de la UAM
instname:Universidad Autónoma de Madrid
instname_str Universidad Autónoma de Madrid
reponame_str Biblos-e Archivo. Repositorio Institucional de la UAM
collection Biblos-e Archivo. Repositorio Institucional de la UAM
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,81155

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