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Number of results
2008 | 113 | 1 | 545-548
Article title

Tunnel Magnetoresistance in Carbon Nanotube Quantum Dot

Content
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EN
Abstracts
EN
The out-of-equilibrium transport properties of carbon nanotube quantum dot in the Kondo regime are studied by means of the non-equilibrium Green function. The equation of motion method is used. The influence of the polarization of electrodes and orbital level splitting, as well as left-right asymmetry, on the spin polarizations of differential conductance are discussed. For zero bias voltage and orbitally degenerate states the SU(4) symmetry of Kondo state is preserved for antiparallel configuration of polarizations of electrodes, whereas it is broken for parallel. In the former case a suppression of linear conductance with increasing polarization is observed. In the latter the behaviour is nonmonotonic due to splitting of the Kondo peak and bringing closer one of the peaks to the Fermi level with increasing polarization. This gives rise to giant tunnel linear magnetoresistance for large polarization.
Keywords
Contributors
author
  • Institute of Molecular Physics, Polish Academy of Sciences, Smoluchowskiego 17, 60-179 Poznań, Poland
author
  • Institute of Molecular Physics, Polish Academy of Sciences, Smoluchowskiego 17, 60-179 Poznań, Poland
References
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  • 5. M.R. Buitelaar, T. Nussbaumer, C. Schnenberger, Phys. Rev. Lett. 88, 156801 (2002)
  • 6. B. Babić, C. Schönenberger, Phys. Rev. B 70, 195408 (2004)
  • 7. A. Cottet et al., Semicond. Sci. Technol. 21, S78 (2006)
  • 8. T.K. Ng, Phys. Rev. Lett. 76, 487 (1996)
Document Type
Publication order reference
Identifiers
YADDA identifier
bwmeta1.element.bwnjournal-article-appv113n1133kz
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