Spin Polarized Transport through Quantum Dots: Coulomb Blockade and Kondo Effect

• Authors: J. Barnaś , R. Świrkowicz , M. Wilczyński , I. Weymann , J. Martinek , V. Dugaev
• Languages of publication: EN

Abstracts

EN

Spin related effects in electronic transport through quantum dots, coupled via tunneling barriers to two metallic leads, are discussed from the point of view of fundamental physics and possible applications in spin electronics. The effects follow either from long spin relaxation time in the dots or from spin dependent tunneling through the barriers when the external leads are ferromagnetic. In the former case large nonequilibrium spin fluctuations in the dot can be induced by flowing current. These fluctuations modify transport characteristics, particularly the shape of the Coulomb steps. In the latter case electric current depends on magnetic configuration of the system, and tunnel magnetoresistance effect due to magnetization rotation can occur. Transport properties in the weak coupling regime are described perturbatively in the first (sequential) and second (cotunneling) orders. In the strong coupling regime, on the other hand, the equation of motion for nonequilibrium Green functions is used to calculate electric current at low temperatures, where the Kondo peak in conductance is formed in the zero bias regime. In symmetrical systems the Kondo peak is split in the parallel magnetic configuration, whereas no splitting occurs for the antiparallel alignment. Theoretical results are discussed in view of available experimental data.

Keywords

EN

72.25.-b; 73.23.Hk; 72.15.Qm

Discipline

• 72.15.Qm: Scattering mechanisms and Kondo effect(see also 75.20.Hr Local moments in compounds and alloys; Kondo effect, valence fluctuations, heavy fermions in magnetic properties and materials)
• 72.25.-b: Spin polarized transport(for spin polarized transport devices, see 85.75.-d)
• 73.23.Hk: Coulomb blockade; single-electron tunneling

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2003
• Volume: 104
• Issue: 2
• Pages: 165-177

Dates

published

2003-08

received

2003-05-30

Contributors

author

J. Barnaś

• Depart. of Physics, A. Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland
• Institute of Molecular Physics, Polish Academy of Sciences, Koszykowa 75, 00-662 Smoluchowskiego 17, 60-179 Poznań, Poland

author

R. Świrkowicz

• Faculty of Physics, Warsaw Technical University, Koszykowa 75, 00-662 Warszawa, Poland

author

M. Wilczyński

• Faculty of Physics, Warsaw Technical University, Koszykowa 75, 00-662 Warszawa, Poland

author

I. Weymann

• Depart. of Physics, A. Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland

author

J. Martinek

• Institute of Molecular Physics, Polish Academy of Sciences, Smoluchowskiego 17, 60-179 Poznań, Poland

author

V. Dugaev

• Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, 06120 Halle, Germany

References

• 1. P. Grünberg, R. Schreiber, Y. Pang, M.B. Brodsky, H. Sowers, Phys. Rev. Lett., 57, 2442, 1986
• 2. S.S.P. Parkin, N. More, K.P. Roche, Phys. Rev. Lett., 44, 2104, 1990
• 3. M.N. Baibich, J.M. Broto, A. Fert, F. Nguyen van Dau, F. Petroff, P. Etienne, G. Creuzet, A. Friederich, J. Chazelas, Phys. Rev. Lett., 61, 5472, 1988
• 4. G. Binasch, P. Grünberg, F. Saurenbach, W. Zinn, Phys. Rev. B, 39, 4818, 1989
• 5. J.M. George, L.G. Pereira, A. Barthelemy, F. Petroff, L. Steren, J.L. Duvail, A. Fero, R. Loloee, P. Holody, P.A. Schroeder, Phys. Rev. Lett., 42, 308, 1994
• 6. M.A.M. Gijs, S.K.J. Lenczowski, J.B. Giesbers, Phys. Rev. Lett., 40, 7343, 1993
• 7. J. Barnaś, A. Fuss, R.E. Camley, P. Grünberg, W. Zinn, Phys. Rev. B, 42, 8110, 1990
• 8. M. Julliere, Phys. Lett. A, 54, 225, 1975
• 9. J.S. Moodera, L.R. Kinder, T.M. Wong, R. Meservey, Phys. Rev. Lett., 74, 3273, 1995
• 10. L.F. Schelp, A. Fert, F. Fettar, P. Holody, S.F. Lee, J.L. Maurice, F. Petrofr, A. Vaures, Phys. Rev. B, 56, R5647, 1997; M. Wilczyński, J. Barnaś, J. Magn. Magn. Mater., 221, 373, 2000
• 11. For a review see Single Charge Tunneling, Eds. H. Grabert, M.H. Devoret, NATO ASI Series, Vol. 294, Plenum Press, New York 1992
• 12. K. Ono, H. Shimada, S. Kozayashi, Y. Outuka, J. Phys. Soc. Jpn., 69, 3959, 1996; H. Shimada, K. Ono, Y. Outuka, J. Phys. Soc. Jpn., 67, 1359, 1998
• 13. J. Barnaś, A. Fert, Phys. Rev. Lett., 80, 1088, 1998; Europhys. Lett., 24, 85, 1998
• 14. S. Takahashi, S. Maekawa, Phys. Rev. Lett., 80, 1758, 1998
• 15. D.C. Ralph, S. Gueron, C.T. Black, M. Tinkham, Physica B, 280, 420, 2000
• 16. J. Barnaś, J. Martinek, G. Michałek, B.R. Bułka, A. Fert, Phys. Rev. B, 62, 12363, 2000
• 17. J. Martinek, J. Barnaś, G. Schön, S. Takahashi, S. Maekawa, J. Supercond., 16, 343, 2003
• 18. T. Fujisawa, D.G. Austing, Y. Tokura, Y. Hirayama, S. Tarucha, Phys. Rev. Lett., 88, 236802, 2002
• 19. L.I. Glazman, M.E. Raikh, JETP Lett., 47, 452, 1988; T.K. Ng, P.A. Lee, Phys. Rev. Lett., 61, 1768, 1988
• 20. S. Sasaki, S. De Franceschi, J.M. Elzerman, W.G. van der Wiel, M. Eto, S. Tarucha, L.P. Kouvenhoven, Nature (London), 405, 764, 2000; J. Gores, D. Goldhaber-Gordon, S. Heemeyer, M.A. Kastner, H. Shtrikman, D. Mahalu, U. Meirav, Phys. Rev. B, 62, 2188, 2000
• 21. N. Sergueev, Q.F. Sun, H. Guo, B.G. Wang, J. Wang, Phys. Rev. B, 65, 165303, 2002
• 22. J. Martinek, Y. Utsumi, H. Imamura, J. Barnaś, S. Maekawa, J. König, G. Schön, cond-mat/0210006 (2002)
• 23. R. Świrkowicz, J. Barnaś, M. Wilczyński, to be published
• 24. D. Weinmann, W. Häusler, B. Kramer, Phys. Rev. Lett., 74, 984, 1995; H. Akera, Phys. Rev. B, 60, 10683, 1999
• 25. K. Tsukagoshi, B.W. Alphenaar, H. Ago, Nature (London), 401, 572, 1999
• 26. L.I. Glazman, K.A. Matveev, Pis'ma Zh. Eksp. Teor. Fiz., 48, 403, 1988 [JETP Lett., 48, 445, 1988]
• 27. W. Rudziński, J. Barnaś, Phys. Rev. B, 64, 085318, 2001
• 28. H. Schoeller, G. Schön, Phys. Rev. B, 50, 18436, 1994; J. König, H. Schoeller, G. Schön, Phys. Rev. B, 58, 7882, 1998
• 29. T.A. Costi, Phys. Rev. Lett., 85, 1504, 2000; J.E. Moore, X.-G. Wen, Phys. Rev. Lett., 85, 1722, 2000
• 30. G.A. Prinz, J. Magn. Magn. Mater., 200, 57, 1999
• 31. R. Świrkowicz, J. Barnaś, M. Wilczyński, J. Phys., Condens. Matter, 14, 2011, 2002
• 32. A.P. Jauho, N.S. Wingreen, Y. Meir, Phys. Rev. B, 50, 5528, 1994

Identifiers

DOI

10.12693/APhysPolA.104.165