Ruido no transporte eletronico em sistemas mesoscopicos / Noise in the electronic transport in mesoscopic systems
AUTOR(ES)
Clovis Correa Junior
DATA DE PUBLICAÇÃO
2009
RESUMO
This dissertation describes the fundamental caracteristics of mesoscopic conductors, and the origins and properties of the sources of noise in conductors. Firstly, we describe the noise through different methods and emphasize the properties of each kind of noise. In the following, we present the scattering approach for coherent phase conductors, which allows us to get the transport properties from a unified picture. It is studied a particular model to describe the transport properties of magnetic transsition metal nanowires and nanocontacts. It is assumed that conduction orbitals are s-like, with the occurrence of only two conductions channel due to spin. In turn, d-like orbitals are sources of local magnetic moments. The model is applied to a simple nanocontact built of two atoms, which are coupled to two magnetic electrodes. Using small external fields, one can handle the polarization state of the electrods: in parallel or antiparallel alignment. From that nanocontact, we investigate the properties of the transmission coe°cient, the conductance, the quantum shot noise, the Fano factor and the magnetoresistance
ASSUNTO(S)
ruido quantico nanocontacts transporte quantico nanofios metais magneticos nanocontatos nanowires magnetic metals quantum noise quantum transport
ACESSO AO ARTIGO
http://libdigi.unicamp.br/document/?code=000439116Documentos Relacionados
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