arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1509.07907cond-mat.mes-hall
收藏

原子链电导振荡的轨道起源探讨

Probing the Orbital Origin of Conductance Oscillations in Atomic Chains

Ran Vardimon, Tamar Yelin, Marina Klionsky, Soumyajit Sarkar, Ariel Biller, Leeor Kronik, Oren Tal

摘要:

我们调查的周期性振荡的电导悬浮金和铂原子链在机械应力下伸长。电导和散粒噪声测量的分析表明,振荡主要涉及到一个特定的传导通道的变化,因为链经历曲折和线性原子配置之间的过渡。计算的局部电子结构表明,振荡起源于不同程度的杂化原子轨道之间沿链的锯齿角的函数。这些变化高度依赖于相关轨道的方向性和对称性,与实验中观察到的Pt和Au振荡幅度之间的数量级差异一致。我们的研究结果表明,电导的结构变化的敏感性可以通过设计原子尺度的导体,原子轨道之间的方向相互作用控制。

英文摘要:

We investigate periodical oscillations in the conductance of suspended Au and Pt atomic chains during elongation under mechanical stress. Analysis of conductance and shot noise measurements reveals that the oscillations are mainly related to variations in a specific conduction channel as the chain undergoes transitions between zigzag and linear atomic configurations. The calculated local electronic structure shows that the oscillations originate from varying degrees of hybridization between the atomic orbitals along the chain as a function of the zigzag angle. These variations are highly dependent on the directionality and symmetry of the relevant orbitals, in agreement with the order-of-magnitude difference between the Pt and Au oscillation amplitudes observed in experiment. Our results demonstrate that the sensitivity of conductance to structural variations can be controlled by designing atomic-scale conductors in view of the directional interactions between atomic orbitals.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑