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2008 | 113 | 1 | 529-532
Article title

Spin-Polarized Transport through Quantum Dots in the Cotunneling Regime

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EN
Abstracts
EN
The spin-polarized transport through two-level quantum dots weakly coupled to ferromagnetic leads is considered theoretically in the Coulomb blockade regime. It is assumed that the dot is doubly occupied, so that the current flows due to cotunneling through singlet and triplet states of the dot. It is shown that, by sweeping the bias voltage, one can induce a singlet-triplet transition, which depends on the magnetic configuration of the system and leads to nontrivial bias dependence of both the differential conductance and tunnel magnetoresistance.
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author
  • Department of Physics, Adam Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland
References
  • 1. S. Maekawa, T. Shinjo, Spin Dependent Transport in Magnetic Nanostructures, Taylor Francis, London 2002
  • 2. W. Rudziński, J. Barnaś, Phys. Rev. B 64, 085318 (2001);M. Braun, J. König, J. Martinek, Phys. Rev. B 70, 195345 (2004)
  • 3. I. Weymann, J. König, J. Martinek, J. Barnaś, G. Schön, Phys. Rev. B 72, 115334 (2005); I. Weymann, Europhys. Lett. 76, 1200 (2006); I. Weymann, J. Barnaś, Phys. Rev. B 75, 155308 (2007)
  • 4. W. Izumida, O. Sakai, S. Tarucha, Phys. Rev. Lett. 87, 216803 (2001)
  • 5. M. Julliere, Phys. Lett. A 54, 225 (1975)
Document Type
Publication order reference
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YADDA identifier
bwmeta1.element.bwnjournal-article-appv113n1129kz
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