ADVANCED ELECTRON
MICROSCOPY & FUNCTIONAL
IMAGING LABORATORY

Our research focuses on the application of aberration-corrected
STEM with emphasis on the unprecedented atomic scale imaging
techniques aimed at unraveling and understanding the various material
property-dependent device performance.

For several decades, studying the microstructure of materials was quite challenging as most of the research works were theoretical. More importantly, providing direct evidence of atomic scale evolution of material properties was nearly impossible due to the limited analytical tools and techniques. However, with the invention of new analysis and interpretational techniques, elucidating the correlation between material nanostructure and device characteristics has become increasingly important for the development of novel materials. Our research focuses on applying aberration-corrected STEM techniques, emphasizing the unprecedented atomic scale imaging techniques to unravel and understand the material property-dependent device performance at the atomic scale. In-depth investigations of phenomena such as atomic scale visualization of antisite defects (such as those observed in LiFePO4) are tackled.

PUBLICATIONS

  • Seokho Moon, Odongo Francis Ngome Okello, Adrien Rousseau, Chang-Won Choi, Youngjae Kim, Yunjae Park, Jiye Kim, Jaewon Kim, Minhyuk Kim, Pierre Valvin, Jaehee Cho, Kenji Watanabe, Takashi Taniguchi, Hu Young Jeong, Giorgia Fugallo, Wilfried Desrat, Feng Ding, JaeDong Lee, Bernard Gil, Guillaume Cassabois*, Si-Young Choi* & Jong Kyu Kim*, "Wafer-scale AA-stacked hexagonal boron nitride grown on a GaN substrate", Nature Materials XX, XX (2025) [pdf]

  • Gahee Noh, Lu Guo, Pratap Pal, Neil Campbell, Mark Steven Rzchowski, Chang-Beom Eom*, and Si-Young Choi*, "Emergent Epitaxial Conguration of Pr3IrO7 Domains via YSZ (111) Substrate", Small Structure XX, 2500005 (2025) [pdf]

  • Lishai Shohan, Itai Silber, Gal Tuvia, Maria Baskin, Soo-Yoon Hwang, Si-Young Choi, Myung-Geun Han, Yimei Zhu, Eilam Yalon, Marcelo J. Rozenberg, Yoram Degan, Felix Trier, Lior Kornblum*, "Gate control of electron correlations towards Mott field effect transistors (MottFET)", APL Materials 13, 021116 (2025) [pdf]

  • Minwook Yoon, Yunkyu Park, Hyeji Sim, Hee Ryeung Kwon, Yujeong Lee, Ho Won Jang, Si-Young Choi, and Junwoo Son* ( equally contributed authors), "2D Vacancy Confinement in Anatase TiO2 for Enhanced Photocatalytic Activities", Advanced Materials XX, 2413062 (2025) [pdf]

  • Jin-Kwang Kim, Hoon Kim, Junyoung Kwon, Hyun-Woo J. Kim, Kwangrae Kim, Seung-Hyeok Ha, Jaehwon Kim, Hyun-Sung Kim, Jimin Kim, Gahee Noh, Gi-Yeop Kim, Si-Young Choi, Jaeku Park, Intae Eom, Dogeun Jang, Sae Hwan Chun, Ayman Said, XianRong Huang, Jungho Kim & B. J. Kim* ( equally contributed authors), "Liquid-like spin dynamics in a hybrid Heisenberg-Ising antiferromagnet", Nature Communications 16, 1547 (2025) [pdf]