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arXiv 1609.09644cond-mat.mes-hallquant-ph
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用单自旋磁强计实现电流密度的纳米级成像

Nanoscale imaging of current density with a single-spin magnetometer

K. Chang, A. Eichler, C. L. Degen

摘要:

纳米结构和薄膜中的电荷传输是科学和技术中许多现象和过程的基础,从介观物理学中的量子效应和电子相关性,到基于电荷或自旋的集成电子电路,再到能源研究中的光活性层。由于其纳米尺寸和电流的巡回性质,在这种结构中直接可视化电荷流是具有挑战性的。在这项工作中,我们展示了非侵入性磁成像的电流密度在二维导体网络,包括金属纳米线和碳纳米管。我们的传感器是电子自旋的金刚石氮空位中心连接到扫描尖端。使用差分测量技术,我们检测直流电流下降到几微安以上的基线电流密度2 e4 A/cm 2。重建图像的空间分辨率通常为50 nm,尽力而为值为22 nm。电流密度成像为研究二维材料和器件中的电子输运和电导变化提供了一条新的途径,在凝聚态物理中有许多令人兴奋的应用。

英文摘要:

Charge transport in nanostructures and thin films is fundamental to many phenomena and processes in science and technology, ranging from quantum effects and electronic correlations in mesoscopic physics, to integrated charge- or spin-based electronic circuits, to photoactive layers in energy research. Direct visualization of the charge flow in such structures is challenging due to their nanometer size and the itinerant nature of currents. In this work, we demonstrate non-invasive magnetic imaging of current density in two-dimensional conductor networks including metallic nanowires and carbon nanotubes. Our sensor is the electronic spin of a diamond nitrogen-vacancy center attached to a scanning tip. Using a differential measurement technique, we detect DC currents down to a few uA above a baseline current density of 2e4 A/cm2. Reconstructed images have a spatial resolution of typically 50 nm, with a best-effort value of 22 nm. Current density imaging offers a new route for studying electronic transport and conductance variations in two-dimensional materials and devices, with many exciting applications in condensed matter physics.

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