Recent Publications

Lorenzo Stella

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  1. Title: Theory of phonon dissipation in the conduction of stressed Au nanowires

    Author(s): Stella L., Santoro G.E., Fabrizio M., Tosatti E,

    Surface Science, 566, No. 1, pp. 430-435 (20 September 2004)

    doi: 10.1016/j.susc.2004.06.121

    Recent experiments on Au break junctions [Phys. Rev. Lett. 88 (2002) 216803] have characterized the nonlinear conductance of stretched short Au nanowires. They reveal in the voltage range 10-20 meV the signatures of dissipation effects, likely due to phonons in the nanowire, reducing the conductance below the quantized value of 2e(2)/h. We present here a theory, based on a model tight-binding Hamiltonian and on non-equilibrium Green's function techniques, which accounts for the main features of the experiment. The theory helps in revealing details of the experiment which need to be addressed with a more realistic, less idealized, theoretical framework.