Theoretical Fluctuations of Conductance in Stretched Monatomic Nanowire
F. Picaud, V. Pouthier, C. Girardet, E. Tosatti
Abstract
Recent experiments showed that the last, single channel conductance step in monatomic gold contacts exhibits significant fluctuations as a function of stretching. From simulations of a stretched gold nanowire linked to deformable tips, we determine the distribution of the bond lengths between atoms forming the nanocontact and analyze its influence on the electronic conductance within a simplified single channel approach. We show that the inhomogeneous distribution of bond lengths can explain the occurrence and the 5% magnitude of conductance fluctuations below the quantum conductance unit go= 2e2/h.
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