Spin and Charge Current in a Short Semiconducting Chain of Paramagnetic Ionic Blocks

• Authors: A. Lehmann-Szweykowska , R. Wojciechowski , R. Micnas
• Languages of publication: EN

Abstracts

EN

We deal with the electric current flowing through a short chain of paramagnetic ionic blocks, coupled to metallic electrodes in the serial configuration. An original three-band Hubbard-Anderson Hamiltonian is diagonalised at the level of the single ionic block. A minimal but sufficient set of the latter's four hybridised eigenstates serves as a basis for the determination of the time-ordered temperature-dependent matrix Green functions, in terms of which all the current-voltage (I-V) characteristics can be expressed provided the coupling to the electrodes is weak. The separation of the opposite-spin contributions to the electric current and, consequently, the spin current from the left to right electrode can result from the on-site Coulomb repulsion term of Hubbard-Anderson Hamiltonian, with no spin polarisation at the electrodes, but with the Zeeman-like coupling of the centre to either a molecular or an external magnetic field.

Keywords

EN

72.25.Dc; 73.61.Le; 73.63.Rt

Discipline

• 73.63.Rt: Nanoscale contacts
• 73.61.Le: Other inorganic semiconductors
• 72.25.Dc: Spin polarized transport in semiconductors

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2009
• Volume: 115
• Issue: 1
• Pages: 260-262

Dates

published

2009-01

Contributors

author

A. Lehmann-Szweykowska

• Faculty of Physics, Adam Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland

author

R. Wojciechowski

• Faculty of Physics, Adam Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland

author

R. Micnas

• Faculty of Physics, Adam Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland

References

• 1. R.J. Wojciechowski, A. Lehmann-Szweykowska, R. Micnas, G.A. Gehring, P.E. Wigen, Phys. Rev. B 69, 2144341 (2004)
• 2. A. Lehmann-Szweykowska, R.J. Wojciechowski, G.A. Gehring, A. Szamer, P.E. Wigen, R. Micnas, Phys. Status Solidi B 244, 2487 (2007)
• 3. A. Lehmann-Szweykowska, R.J. Wojciechowski, R. Micnas, J. Phys., Conf. Series 104, 012024 (2008)
• 4. T. Kostyrko, B. Bułka, Mater. Sci. 22, 497 (2004)
• 5. H. Haug, A.-P. Jauho, Quantum Kinetics in Transport and Optics of Semiconductors, Springer-Verlag, Berlin 1998
• 6. Y. Meir, N.S. Wingreen, Phys. Rev. Lett. 68, 2512 (1992)
• 7. T. Kostyrko, B. Bułka, Phys. Rev. B 71, 235306 (2005)

Identifiers

DOI

10.12693/APhysPolA.115.260