Filtros de spin não-magneticos controlados por voltagem / Voltage controlled non-magnetic spin filters
AUTOR(ES)
Hugo Bonette de Carvalho
DATA DE PUBLICAÇÃO
2006
RESUMO
The aim of this work was to study the transport properties of nonmagnetic semiconductor heterostructures: double barrier diodes ? DBD. Our attention was focused on the carrier spin polarization through the structure. First we present the phenomenology behind the carrier transport and how the DBD can act as a spin filter. In the sequence, we present the experimental procedures. We combine optical and transport measurements to completely characterize the transport through the DBD. We present the results of the investigation of a p-i-p and a p-i-n symmetric GaAs/AlAs DBD under a magnetic field. For both diodes, we show that the tunneling processes through the DBD associated to Zeeman effect can result in the selection of the carriers spin. For the p-i-p sample, we also report a modulation of the spin-splitting energy by an external bias which is an experimental evidence of coupling between the electric field and the spin degree of freedom of carriers. These results demonstrate that a nonmagnetic DBD can be used as a voltage-controlled spin filter for the development of spintronic devices
ASSUNTO(S)
spintronics spin filters filtros de spin spintronica non-magnetic materials materiais não-magneticos diodos de dupla barreira double barrier diodes
ACESSO AO ARTIGO
http://libdigi.unicamp.br/document/?code=vtls000394886Documentos Relacionados
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