Research Abstract

単原子の電場イメージング ブックマーク

Electric field imaging of single atoms

2017年5月30日 Nature Communications 8 : 15631 doi: 10.1038/ncomms15631 (2017)


Naoya Shibata, Takehito Seki, Gabriel Sánchez-Santolino, Scott D. Findlay, Yuji Kohno, Takao Matsumoto, Ryo Ishikawa and Yuichi Ikuhara

Corresponding Author

柴田 直哉
東京大学大学院 工学系研究科 総合研究機構

In scanning transmission electron microscopy (STEM), single atoms can be imaged by detecting electrons scattered through high angles using post-specimen, annular-type detectors. Recently, it has been shown that the atomic-scale electric field of both the positive atomic nuclei and the surrounding negative electrons within crystalline materials can be probed by atomic-resolution differential phase contrast STEM. Here we demonstrate the real-space imaging of the (projected) atomic electric field distribution inside single Au atoms, using sub-Å spatial resolution STEM combined with a high-speed segmented detector. We directly visualize that the electric field distribution (blurred by the sub-Å size electron probe) drastically changes within the single Au atom in a shape that relates to the spatial variation of total charge density within the atom. Atomic-resolution electric field mapping with single-atom sensitivity enables us to examine their detailed internal and boundary structures.