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.

RESEARCH INTEREST

PUBLICATIONS

  • Dongwon Shin†, Inseo Kim†, Min-Su Kim, Yu-Qiao Zhang, Woo Tack Lim, Si-Young Choi, Minseok Choi*, Hiromichi ohta*, and Woo seok Choi*, "Improving 2D-ness to enhance thermopower in oxide superlattices", Reports on Progress in Physics XX, XX (2025) http://doi.org/10.1088/1361-6633/ae2f96

  • Kil-Dong Sung†, Min-Su Kim†, Jinhyuk Jang, Gi-Yeop Kim, Kyung Song, Si-Young Choi*, Seungbum Hong, "Selective a-domain switching by sub-coercive field in PbTiO3 thin films", Microstructures XX, XX (2025) (Accepted)

  • Gunho Moon†, Suk-Ho Lee†, Hyunje Cho†, Heewon Park, Heonsu Ahn, Chang-Won Choi, Sera Yang, Seung-Hyun Shin, Jinjae Kim, Jong Yun Choi, Seok Young Min, Sumin Lee, Hyunjin Jung, Jaeyoung Kim, Jewook Park, Han Woong Yeom, Gil-Ho Lee, Myungchul Oh, Jong-Hoon Kang, Hyunyong Choi, Cheol-Joo Kim, Jonghwan Kim, Si-Young Choi and Moon-Ho Jo*, "Single-crystalline monolayer semiconductors with coherent quantum transport by vicinal van der Waals epitaxy", Nature electronics XX, XX (2025) [DOI] https://doi.org/10.1038/s41928-025-01496-x

  • Hyunseok Song, Yongmei Jin, Hongseok Kim, Jaechan Shim, Yunseok Kim, Chul-Lee Lee, Si-Young Choi, Nayeon Kang, Minjung Kim, Tek-Kyoung Sung, Ali Habib Akhyari, Susan Trolier-Mckinstry, Jung-Min Park, Hyun-Cheol Song, Yu U. Wang*, Dae-Yong Jeong* and Jungho Ryu*, "Artificial Morphotropic Phase Boundary Associated with Nano-Clustering in Lead Zirconate-Lead Titnate Composite Films", Advanced Functional Materials XX, XX (2025) [DOI] https://doi.org/10.1002/adfm.202525400

  • Min-Su Kim†, Kyoungjun Lee†, Ryo Ishikawa†, Kyung Song, Naafis Ahnaf Shahed, Ki-Tae Eom, Mark S. Rzchowski, Evgeny Y. Tsymbal, Naoya Shibata, Teruyasu Mizoguchi*, Chang-Beom Eom*, and Si-Young Choi*, "Charge Disproportionation at Twisted SrTiO3 Bilayer Interface Driven by Local Atomic Registry", ACS Nano 19, 39714-39724 (2025) [Supplementary Journal Cover] [DOI] http://doi.org/10.1021/acsnano.5c11685