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MA: Magnetismus

MA 17: Spinabh
ängiger Transport II

MA 17.6: Vortrag

Montag, 7. März 2005, 11:45–12:00, TU H1012

Transport in nanowires: An ab initio describtion — •Michael Czerner¹, Alexej Bagrets¹, Valeri Stepanyuk^1,2, Andrey Klavsyuk¹, and Ingrid Mertig¹ — ¹Martin Luther University Halle-Wittenberg, Department of Physics, Von-Seckendorff-Platz 1, 06120 Halle, Germany — ²Max Planck Institute of Microstructure Physics, Weinberg 2, 06120 Halle, Germany

We present ab-initio calculations of the tranport properties of metallic atomic-sized nanowires. The nanowires were modelled by atomic chains of Cu, Co and Al suspended between two semi-infinite leads of the same material. We used the first principle screened Korringa-Kohn-Rostoker method to calculate the electronic properties of the systems, treating the leads and atomic chains on the same footing without any model parameters. The geometrical structure of the atomic chains was relaxed using ab initio based many body potentials. The Landauer formalism was applied to investigate the conductance. Quantum size effects,the influence of relaxation and the channel decomposition of the conductance is discussed in detail.