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

  • Jie Ren†, Ping-Luen Baron Ho†, Lei Jin, Si-Young Choi, Rafal E. Dunin-Borkowski, Joachim Mayer, Sandrine E. M. Heutz, Michele Shelly Conroy, Shik Chi Edman Tsang, and Xiaoyan Zhong*, "Perovskite Oxide Interfaces Tailored by Cation Ordering Periodicities: Experimentally Resolved Atomic Structure and Predicted Magnetic Coupling", ACS Applied Materials & Interfaces XX, XX (2026) (Accepted)

  • Pratap Pal, Xiaoxi Deng, Gi-Yeop Kim, Kyoungjun Lee, Jheng-Cyuan Lin, Prithwijit Mandal, Jiangfeng Yang, Paul Steadman, Pascal Manuel, Roger D. Johnson, Si-Young Choi, Paolo G. Radaelli, and Chang-Beom Eom* "Atomistic Kinetics of Dislocation-Mediated Grain Growth in Monolayer MoS2", Advanced Functional Materials, Early View, e77954 (2026) [pdf]

  • Chang-Won Choi†, Min-Yeong Choi†, Tao Du, Jinho Rhee, Seokho Moon, Yeon-Seo Nam, Xiaoyan Lu, Jong Kyu Kim, Moon-Ho Jo, Cheol-Joo Kim*, and Si-Young Choi* "Atomistic Kinetics of Dislocation-Mediated Grain Growth in Monolayer MoS2", Advanced Science XX, XX (2026) (Accepted)

  • Hyun-Jae Lee†, Pawan Kumar†, Kyoung-June Go†, Chang Hoon Kim, Yungyeom Kim, Kyoungjun Lee, Takao Shimizu, Seung Chul Chae, Hosub Jin, Minseong Lee, Umesh Waghmare, Si-Young Choi*, and Jun Hee Lee* "Bulklike Costless Domain Walls Driven by Phonon Pair Condensation in HfO2", Physical Review X, 16, 031041 (2026) [pdf]

  • Chenghyun Hong†, Fangzhou Zhao†, Su-Beom Song, Sangho Yoon, Seong-Joon Jeon, M.Ajmal Khan, Ye Tao, Dong-Hwan Yang, Wanhee Lee, Junho Kim, Sera Yang, Hyungseob Cho, Sumin Lee, Seok Young Min, Kenji Watanabe, Takashi Taniguchi, Seunghyup Yoo, Changsoon Cho, Si-Young Choi, Hideki Hirayama, Lede Xian, Moon-Ho Jo, Angel Rubio and Jonghwan Kim, "High efficient, deep-ultraviolet luminescence in hBN moire quantum wells", Science XX, XX (2026) [pdf]