Dunford Jeffrey L, Dhirani Al-Amin
Department of Chemistry, University of Toronto, Toronto, ON, M5S 3H6, Canada.
Nanotechnology. 2008 Jan 16;19(2):025202. doi: 10.1088/0957-4484/19/02/025202. Epub 2007 Dec 6.
Charge transport across a disordered normal-superconductor (DN-S) interface was studied using a macroscopic, molecularly linked Au nanoparticle film as the DN component. Low-temperature conductance versus voltage and magnetic field exhibit zero-bias and zero-field peaks, respectively. Importantly, the latter typically exhibit superimposed oscillations. Such oscillations are rarely seen in other DN-S systems and are remarkable given their robustness in these macroscopic films and interfaces. A number of observations indicate that conductance peaks and oscillations arise due to a 'reflectionless tunnelling' process. Scattering length scales extracted from the data using a reflectionless tunnelling picture are consistent with literature values. Factors resulting in the observation of oscillations in this system are discussed.
使用宏观的、分子连接的金纳米颗粒薄膜作为正常-超导体（DN-S）组件，研究了电荷在无序的正常-超导体界面上的传输。低温下的电导与电压以及磁场的关系分别呈现出零偏置峰和零场峰。重要的是，后者通常呈现出叠加振荡。这种振荡在其他DN-S系统中很少见，并且鉴于它们在这些宏观薄膜和界面中的稳健性，显得尤为突出。大量观察结果表明，电导峰和振荡是由“无反射隧穿”过程引起的。使用无反射隧穿图像从数据中提取的散射长度尺度与文献值一致。讨论了导致在该系统中观察到振荡的因素。
