Graphene single-electron transistor as a spin sensor for magnetic adsorbates
Contribuinte(s) |
Universidad de Alicante. Departamento de Física Aplicada Grupo de Nanofísica |
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Data(s) |
31/10/2013
31/10/2013
20/02/2013
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Resumo |
We study single-electron transport through a graphene quantum dot with magnetic adsorbates. We focus on the relation between the spin order of the adsorbates and the linear conductance of the device. The electronic structure of the graphene dot with magnetic adsorbates is modeled through numerical diagonalization of a tight-binding model with an exchange potential. We consider several mechanisms by which the adsorbate magnetic state can influence transport in a single-electron transistor: tuning the addition energy, changing the tunneling rate, and in the case of spin-polarized electrodes, through magnetoresistive effects. Whereas the first mechanism is always present, the others require that the electrode has to have either an energy- or spin-dependent density of states. We find that graphene dots are optimal systems to detect the spin state of a few magnetic centers. This work has been financially supported by MEC-Spain (Grant Nos. FIS2010-21883-C02-01 and CONSOLIDER CSD2007-0010) as well as Generalitat Valenciana, grant Prometeo 2012-11. |
Identificador |
Phys. Rev. B. 2013, 87: 085433 [6 pages]. doi:10.1103/PhysRevB.87.085433 1098-0121 (Print) 1550-235X (Online) http://hdl.handle.net/10045/33597 10.1103/PhysRevB.87.085433 |
Idioma(s) |
eng |
Publicador |
American Physical Society |
Relação |
http://dx.doi.org/10.1103/PhysRevB.87.085433 |
Direitos |
©2013 American Physical Society info:eu-repo/semantics/openAccess |
Palavras-Chave | #Single-electron transport #Graphene quantum dot #Magnetic adsorbates #Física de la Materia Condensada |
Tipo |
info:eu-repo/semantics/article |