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In this paper, we study the conductance and shot noise in transport through amulti-site system in a two terminal configuration. The dependence of thetransport on the number of atoms in the atomic wire is investigated using atight-binding Hamiltonian and the nonequilibrium Green's function method. Inaddition to reproducing the even-odd behavior in the transmission probabilityat the Fermi energy or the linear response conductance in the normal-atomicwire-normal metallic(NAN) junctions, we find the following: (i) The shot noiseis larger in the even-numbered atomic wire than in the odd-numbered wire. (ii)The Andreev conductance displays the same even-odd parity effects in thenormal-atomic wire-superconducting(NAS) junctions. In general, the conductanceis higher in the odd-numbered atomic wire than in the even-numbered wire. Whenthe number of sites ($N$) is odd and the atomic wire is mirror symmetric withrespect to the center of the atomic wire, the conductance does not depend onthe details of the hopping matrices in the atomic wire, but is solelydetermined by the coupling strength to the two leads. When $N$ is even, theconductance is sensitive to the values of the hopping matrices.Comment: 12 pages, 9 figure

Even-odd parity effects in conductance and shot noise of metal–atomic-wire–metal (superconducting) junctions