Title variants
Languages of publication
Abstracts
We analyze the spin-dependent conductance and spin polarization of a double quantum dot in a T-shape configuration coupled to ferromagnetic leads in the presence of external magnetic field. The calculations are performed with the aid of the numerical renormalization group method. We show that in the antiparallel configuration, finite magnetic field can give rise to the full spin polarization of the current, which can be controlled by tuning the dots' levels. On the other hand, for parallel configuration enhanced spin polarization can be generated by an exchange field due to the presence of ferromagnetic leads and can be also tuned by changing level position or external magnetic field. The magnetic field can be thus used to improve the spin-resolved properties of the system.
Discipline
Journal
Year
Volume
Issue
Pages
222-224
Physical description
Dates
published
2015-02
Contributors
author
- Faculty of Physics, Adam Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland
author
- Faculty of Physics, Adam Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland
References
- [1] W.G. van der Wiel, S. De Franceschi, J.M. Elzerman, T. Fujisawa, S. Tarucha, L.P. Kouwenhoven, Rev. Mod. Phys. 75, 1 (2003), doi: 10.1103/RevModPhys.75.1
- [2] U. Fano, Phys. Rev. 124, 1866 (1961), doi: 10.1103/PhysRev.124.1866
- [3] A.C. Hewson, The Kondo Problem to Heavy Fermions, Cambridge University Press, Cambridge 1993
- [4] S. Sasaki, H. Tamura, T. Akazaki, T. Fujisawa, Phys. Rev. Lett. 103, 266806 (2009), doi: 10.1103/PhysRevLett.103.266806
- [5] R. Žitko, Phys. Rev. B 81, 115316 (2010), doi: 10.1103/PhysRevB.81.115316
- [6] L.G.G.V. Dias da Silva, E. Vernek, K. Ingersent, N. Sandler, S.E. Ulloa, Phys. Rev. B 87, 205313 (2013), doi: 10.1103/PhysRevB.87.205313
- [7] J. Martinek, Y. Utsumi, H. Imamura, J. Barnaś, S. Maekawa, J. König, G. Schön, Phys. Rev. Lett. 91, 127203 (2003), doi: 10.1103/PhysRevLett.91.127203
- [8] M. Gaass, A.K. Hüttel, K. Kang, I. Weymann, J. von Delft, Ch. Strunk, Phys. Rev. Lett. 107, 176808 (2011), doi: 10.1103/PhysRevLett.107.176808
- [9] K.G. Wilson, Rev. Mod. Phys. 47, 773 (1975), doi: 10.1103/RevModPhys.47.773
- [10] We use the open-access Budapest NRG code, O. Legeza, C.P. Moca, A.I. Tóth, I. Weymann, G. Zaránd, arXiv: 0809.3143 (2008), unpublished. The code is available at: http://www.phy.bme.hu/dmnrg/
- [11] K.P. Wójcik, I. Weymann, Phys. Rev. B 90, 115308 (2014), doi: 10.1103/PhysRevB.90.115308
Document Type
Publication order reference
Identifiers
YADDA identifier
bwmeta1.element.bwnjournal-article-appv127n2017kz