2,627 research outputs found
Helicoidal Fields and Spin Polarized Currents in CNT-DNA Hybrids
We report on theoretical studies of electronic transport in the archetypical
molecular hybrid formed by DNA wrapped around single-walled carbon nanotubes
(CNTs). Using a Green's function formalism in a -orbital tight-binding
representation, we investigate the role that spin-orbit interactions play on
the CNT in the case of the helicoidal electric field induced by the polar
nature of the adsorbed DNA molecule. We find that spin polarization of the
current can take place in the absence of magnetic fields, depending strongly on
the direction of the wrapping and length of the helicoidal field. These
findings open new routes for using CNTs in spintronic devices.Comment: 4 pages, 5 figure
Electron-phonon scattering in graded quantum dots
Theoretical calculations of electron-phonon scattering rates in GaAs/AlxGa1¡xAs spherical quantum dots have been performed by means of effective mass approximation in the frame of finite element method. The influence of a roughness interface and external magnetic fields are analysed for different scattering rate transition. Our results open interesting channels for electron dephasing times manipulation. Keywords: Theoretical calculations; Electron-phonon scattering; GaAs/AlxGa1¡xA
Novos clones de mandioca para a os Tabuleiros Costeiros do Nordeste
bitstream/item/125319/1/Mandioca-ClonesNordeste.pd
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