Experimental study on current-induced force in metallic monatomic wires

建立了金属单原子导线的力学和电学性能同步测量系统，对导线中的电流感应力进行了实验研究。采用机械可控断接与音叉相结合的力传感器。用几种理论模型对音叉测量值进行了分析，确定了具有较好定量近似的模型。在低温条件下测量了金单原子线的力学和电学性能。虽然观察到音叉的共振频率由于单原子丝的形成而发生了移位，但没有发现测量到的机械性能明显的偏倚依赖性。

Simultaneous measurement system on mechanical and electrical properties of a metallic monatomic wire was built to study experimentally a current-induced force in the wire. The mechanically controllable break junction combined with a tuning fork as a force sensor was used. Measured values using the tuning fork were analyzed by several theoretical models, and the model showing a good quantitative approximation was determined. Mechanical and electrical properties of Au monatomic wires were measured under a low temperature. Although it was observed that the resonance frequency of the tuning fork was shifted due to monatomic wire formation, a clear bias-dependence of the mechanical properties measured was not found.