Correlation between Quantum Conductance and Atomic Arrangement of Silver Atomic-Size Nanowires

TL;DR

This study investigates how temperature influences the structural and quantum conductance properties of silver atomic-scale nanowires, revealing complex correlations and metastable structures through combined microscopy and transport measurements.

Contribution

It provides the first detailed correlation between atomic arrangements and quantum conductance in silver nanowires at different temperatures, highlighting temperature-dependent mechanical and electronic behaviors.

Findings

Temperature significantly affects nanowire conductance and structure.

Metastable rectangular rod-like Ag wires form more readily at certain conditions.

Structural and conductance behaviors are highly complex and temperature-dependent.

Abstract

We have studied the effect of thermal effects on the structural and transport response of Ag atomic-size nanowires generated by mechanical elongation. Our study involves both time-resolved atomic resolution transmission electron microscopy imaging and quantum conductance measurement using an ultra-high-vacuum mechanically controllable break junction. We have observed drastic changes in conductance and structural properties of Ag nanowires generated at different temperatures (150 and 300 K). By combining electron microscopy images, electronic transport measurements and quantum transport calculations, we have been able to obtain a consistent correlation between the conductance and structural properties of Ag NWs. In particular, our study has revealed the formation of metastable rectangular rod-like Ag wire (3/3) along the (001) crystallographic direction, whose formation is enhanced. These results illustrate the high complexity of analyzing structural and quantum conductance behaviour of metal atomic-size wires; also, they reveal that it is extremely difficult to compare NW conductance experiments performed at different temperatures due to the fundamental modifications of the mechanical behavior.