The resistance of wires consisting of 1--3 atoms connecting two semi-infinite metallic electrodes is calculated for both small and large bias. The wires discussed consist of Al atoms, with one of the Al atoms substituted by S in certain cases. The resistances obtained are in the range 7--{~}30 k{Ω}. For the three-atom wire, the value of the resistance when the S atom is present depends on the order of the atoms in the wire. When the S is an end atom, the resistance at larger bias also shows a dependence on polarity (diode behavior). These studies involve a self-consistent calculation of the electron density distribution for the entire electrode/wire system.
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N. D. Lang (1995) studied this question.
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