Interband scattering at metallic nano-junctions
2002
Abstract Interband scattering effect is examined on the electron transport through nano-scale break-junctions of transition metals. Numerical calculations are performed using multi-band tight-binding models. In a model with broad and narrow s bands, the conductance is almost quantized in units of 2 e 2 / h , as in the case of single band. In another model with broad s and narrow p bands, the situation is completely different: the conductance is substantially suppressed by the interband scattering. Based on the calculated results, we suggest a possible mechanism for the conductance quantization in units of e 2 / h for Ni which has 4s and 3d bands at the Fermi level.
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