Yayoi 2-11-16, Bunkyo-ku, Tokyo, Japan, 113-8656
mail: tabata  sigma.t.u-tokyo.ac.jp(please insert @ instead of space)
I am developing a method to directly observe atomic vibrations at the atomic scale by scanning transmission electron microscopy (STEM). In recent years, it has become important to understand heat transport in nanoscale materials such as thermoelectric materials and electronic devices. Phonons are scattered by crystal defect structures such as atomic vacancies, substituted atoms, and grain boundaries. Direct measurement of atomic vibrations in the local region is required to elucidate the correlation between the local atomic structure and heat transport. However, a method for quantitative observation of thermal vibrations in such local regions has not yet been established. In this research, the aim is to realize direct observation of atomic vibrations in the local region by combining a STEM with a segmented detector.