Disorder-based graphene spintronics
Contribuinte(s) |
UNIVERSIDADE DE SÃO PAULO |
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Data(s) |
20/10/2012
20/10/2012
2010
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Resumo |
The use of the spin of the electron as the ultimate logic bit-in what has been dubbed spintronics-can lead to a novel way of thinking about information flow. At the same time single-layer graphene has been the subject of intense research due to its potential application in nanoscale electronics. While defects can significantly alter the electronic properties of nanoscopic systems, the lack of control can lead to seemingly deleterious effects arising from the random arrangement of such impurities. Here we demonstrate, using ab initio density functional theory and non-equilibrium Green`s functions calculations, that it is possible to obtain perfect spin selectivity in doped graphene nanoribbons to produce a perfect spin filter. We show that initially unpolarized electrons entering the system give rise to 100% polarization of the current due to random disorder. This effect is explained in terms of different localization lengths for each spin channel which leads to a new mechanism for the spin filtering effect that is disorder-driven. FAPESP Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) CNPq Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) |
Identificador |
NANOTECHNOLOGY, v.21, n.34, 2010 0957-4484 http://producao.usp.br/handle/BDPI/29356 10.1088/0957-4484/21/34/345202 |
Idioma(s) |
eng |
Publicador |
IOP PUBLISHING LTD |
Relação |
Nanotechnology |
Direitos |
restrictedAccess Copyright IOP PUBLISHING LTD |
Palavras-Chave | #CARBON NANOTUBES #GIANT MAGNETORESISTANCE #TRANSPORT CALCULATIONS #QUANTUM TRANSPORT #SPIN #LOCALIZATION #BORON #GAS #EXCHANGE #DEFECTS #Engineering, Multidisciplinary #Nanoscience & Nanotechnology #Materials Science, Multidisciplinary #Physics, Applied |
Tipo |
article original article publishedVersion |