Quantum Confinement of Dirac Quasiparticles in Graphene Patterned with Sub‐Nanometer Precision
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Título: | Quantum Confinement of Dirac Quasiparticles in Graphene Patterned with Sub‐Nanometer Precision |
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Autor/es: | Cortés‐del Río, Eva | Mallet, Pierre | González‐Herrero, Héctor | Lado, Jose L. | Fernández-Rossier, Joaquín | Gómez‐Rodríguez, José María | Veuillen, Jean‐Yves | Brihuega, Iván |
Grupo/s de investigación o GITE: | Grupo de Nanofísica |
Centro, Departamento o Servicio: | Universidad de Alicante. Departamento de Física Aplicada |
Palabras clave: | Atomic manipulation | Graphene | Graphene quantum dots | Nanopatterning | Scanning tunneling microscopy |
Área/s de conocimiento: | Física de la Materia Condensada |
Fecha de publicación: | 29-jul-2020 |
Editor: | Wiley-VCH Verlag GmbH & Co. KGaA |
Cita bibliográfica: | Advanced Materials. 2020, 32(30): 2001119. https://doi.org/10.1002/adma.202001119 |
Resumen: | 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 fermions. |
Patrocinador/es: | This work was supported by AEI and FEDER under projects MAT2016-80907-P and MAT2016-77852-C2-2-R (AEI/FEDER, UE) by the Fundación Ramón Areces, the Comunidad de Madrid NMAT2D-CM program under grant S2018/NMT-4511, and the Spanish Ministry of Science and Innovation, through the “María de Maeztu” Programme for Units of Excellence in R&D (CEX2018-000805-M). European Union through the FLAG-ERA program HiMagGraphene project PCIN-2015-030; No. ANR-15-GRFL-0004) and the Graphene Flagship program (Grant agreement 604391). J.L.L acknowledges financial support from the ETH Fellowship program; J.F.-R. acknowledges supported by Fundação para a Ciência e a Tecnologia grants P2020-PTDC/FIS-NAN/3668/2014 and TAPEXPL/NTec/0046/2017. |
URI: | http://hdl.handle.net/10045/108410 |
ISSN: | 0935-9648 (Print) | 1521-4095 (Online) |
DOI: | 10.1002/adma.202001119 |
Idioma: | eng |
Tipo: | info:eu-repo/semantics/article |
Derechos: | © 2020 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim |
Revisión científica: | si |
Versión del editor: | https://doi.org/10.1002/adma.202001119 |
Aparece en las colecciones: | INV - Grupo de Nanofísica - Artículos de Revistas |
Archivos en este ítem:
Archivo | Descripción | Tamaño | Formato | |
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Cortes-del-Rio_etal_2020_AdvMater_final.pdf | Versión final (acceso restringido) | 2,05 MB | Adobe PDF | Abrir Solicitar una copia |
Cortes-del-Rio_etal_2020_AdvMater_preprint.pdf | Preprint (acceso abierto) | 2,08 MB | Adobe PDF | Abrir Vista previa |
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