Theoretical study of conductance in stretched monatomic nanowires

[摘要] 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 g(0) = 2e(2)/h. (C) 2003 Elsevier B.V. All rights reserved.

[发布日期] 2003-12-20

[关键词] gold;Green's function methods;surface electrical transport (surface conductivity;surface recombination, etc.)