Atomic dimer shuttling and two-level conductance fluctuations in Nb nanowires.
Atomic dimer shuttling and two-level conductance fluctuations in Nb nanowires.
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DOI：
10.1103/physrevlett.98.046802
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发表时间：
2007-01
影响因子：
8.6
通讯作者：
A. Marchenkov;Z. Dai;Chun Zhang;R. Barnett;U. Landman
中科院分区：
文献类型：
--
作者：
A. Marchenkov;Z. Dai;Chun Zhang;R. Barnett;U. Landman
我们介绍了超导转变温度以下的Nb纳米线的高分辨率电导测量。在伸长过程中，我们发现一个双稳区域表现为随机电报噪声。密度泛函结构优化和电导计算再现并解释了测量结果。特别是，观察到的双稳态与相对电极之间形成的二聚体Nb有关，该二聚体在间隙中的对称、高电导和非对称的低电导构型之间穿梭。
We present high-resolution conductance measurements in niobium nanowires below the superconducting transition temperature. During elongation we find a bistability region manifesting itself as random telegraph noise. Density functional structural optimizations and conductance calculations reproduce and explain the measurements. In particular, the observed bistability is associated with the formation of a niobium dimer between the opposing electrodes, with the dimer shuttling between a symmetric, high conductance, and an asymmetric, low-conductance configurations in the gap.