Abstract
Theoretical studies of the conductance of Ni and Cu ultrathin wires are performed for both the ideal purely ballistic case and structures with constrictions (necks), under constraint of local charge neutrality. The computational method is based on realistic tight-binding Hamiltonian and a Landauer-type conductance expression derived by means of the Green's function technique. It is shown that in the presence of short nonadiabatic constrictions the conductance is no longer quantized at integer multiples of e2/h. Besides: (i) a plot has been made to visualize how the number of contact atoms influences the conductance, and (ii) the spin polarization of Ni conductance has been revealed.
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