Publications

2025

Phonon-pair-driven Ferroelectricity Causes Costless Domain-walls and Bulk-boundary Duality

Hyun-Jae Lee, Kyoung-June Go, Pawan Kumar, Chang Hoon Kim, Yungyeom Kim, Kyoungjun Lee, Takao Shimizu, Seung Chul Chae, Hosub Jin, Minseong Lee, Umesh Waghmare, Si-Young Choi, Jun Hee Lee

Submitted

Charge Disproportionation at Twisted SrTiO3 Bilayer Interface Driven by Local Atomic Registry

Min-Su Kim, Kyoungjun Lee, Ryo Ishikawa, Kyung Song, Naafis Ahnaf Shahed, Kitae Eom, Mark S Rzchowski, Evgeny Y Tsymbal, Naoya Shibata, Teruyasu Mizoguchi, Chang-Beom Eom, Si-Young Choi

ACS Nano 19(46), 39714

Magnetically tuned metal-insulator transition in nanowire arrays

Ranjani Ramachandran, Shashank Anand, Kitae Eom, Kyoungjun Lee, Dengyu Yang, Muqing Yu, Sayanwita Biswas, Aditi Nethwewala, Chang-Beom Eom, Patrick Irvin, Erica Carlson, Jeremy Levy

Physical Review B 112(12), 125415

Nanoscale control of LaAlO3/SrTiO3 conductance beyond the polar catastrophe

Muqing Yu, Kyoungjun Lee, Juliana Sebolt, Kitae Eom, Jieun Kim, Patrick Irvin, Chang-Beom Eom, Jeremy Levy

Journal of Applied Physics 138(9), 095303

Scalable Programming of LaAlO3/SrTiO3 Interfaces via Ultra‐Low‐Voltage Electron‐Beam Lithography

Dengyu Yang, Ranjani Ramachandran, Muqing Yu, Kitae Eom, Kyoungjun Lee, Patrick Irvin, Chang‐Beom Eom, Jeremy Levy

Advanced Materials Interfaces 12(21), e00442

2024

Atomic-Scale Scanning of Domain Network in the Ferroelectric HfO2 Thin Film

Kunwoo Park, Dongmin Kim, Kyoungjun Lee, Hyun-Jae Lee, Jihoon Kim, Sungsu Kang, Alex Lin, Alexander J Pattison, Wolfgang Theis, Chang Hoon Kim, Hyesung Choi, Jung Woo Cho, Peter Ercius, Jun Hee Lee, Seung Chul Chae, Jungwon Park

ACS Nano 18(38), 26315

Feld-induced modulation of two-dimensional electron gas at LaAlO3/SrTiO3 interface by polar distortion of LaAlO3

Jinsol Seo, Hyungwoo Lee, Kitae Eom, Jinho Byun, Taewon Min, Jaekwang Lee, Kyoungjun Lee, Chang-Beom Eom, Sang Ho Oh

Nature Communications 15(1), 5268

Deterministic Orientation Control of Ferroelectric HfO2 Thin Film Growth by a Topotactic Phase Transition of an Oxide Electrode

Kyoungjun Lee, Kunwoo Park, In Hyeok Choi, Jung Woo Cho, Myeong Seop Song, Chang Hoon Kim, Jun Hee Lee, Jong Seok Lee, Jungwon Park, Seung Chul Chae

ACS Nano 18(20), 12707

Surface triggered stabilization of metastable charge-ordered phase in SrTiO3

Kitae Eom, Bongwook Chung, Sehoon Oh, Hua Zhou, Jinsol Seo, Sang Ho Oh, Jinhyuk Jang, Si-Young Choi, Minsu Choi, Ilwan Seo, Yun Sang Lee, Youngmin Kim, Hyungwoo Lee, Jung-Woo Lee, Kyoungjun Lee, Mark Rzchowski, Chang-Beom Eom, Jaichan Lee

Nature Communications 15(1), 1180

2023

Selective Crystallization of Ferroelectric HfxZr1–xO2 via Excimer Laser Annealing

Myeong Seop Song, Kunwoo Park, Kyoungjun Lee, Jung Woo Cho, Tae Yoon Lee, Jungwon Park, Seung Chul Chae

ACS Applied Electronic Materials 5(1), 117

2022

Conditional radiation tolerance of ferroelectric Hf0.5Zr0.5 O2 thin film under 60Co gamma-ray irradiation

Jin Namkung, Myeong Seop Song, Kyu Cheol Lee, Kyoungjun Lee, Jung Woo Cho, Seung Chul Chae

Applied Physics Letters 120(16), 162903

Giant tunneling electroresistance in epitaxial ferroelectric ultrathin films directly integrated on Si

Kyoungjun Lee, Jinho Byun, Kunwoo Park, Sungsu Kang, Myeong Seop Song, Jungwon Park, Jaekwang Lee, Seung Chul Chae

Applied Materials Today 26, 101308

2021

Local field inhomogeneity and ferroelectric switching dynamics in thin films

Myeong Seop Song, Kyu Cheol Lee, Jong Chan Choi, Kyoungjun Lee, Seung Chul Chae

Physical Review Materials 5(11), 114408

Enhanced ferroelectric switching speed of Si-doped HfO2 thin film tailored by oxygen deficiency

Kyoungjun Lee, Kunwoo Park, Hyun-Jae Lee, Myeong Seop Song, Kyu Cheol Lee, Jin Namkung, Jun Hee Lee, Jungwon Park, Seung Chul Chae

Scientific reports 11(1), 6290

2020

Charge transfer and magnetotransport properties of Sr 1–x La x Ru 1–x Co x O 3 epitaxial thin films

Umasankar Dash, D Kumar, Kyoungjun Lee, TS Suraj, MS Ramachandra Rao, Seung Chul Chae, A Fouchet, Suyoun Lee, Wilfrid Prellier, Chang Uk Jung

Journal of Alloys and Compounds 847, 156142

Electric field cycling-mediated variations in defect distributions associated with wake-up and split-up behaviors of a ferroelectric Si-doped HfO2 thin film

Myeong Seop Song, Tae Yoon Lee, Kyoungjun Lee, Kyu Cheol Lee, Seung Chul Chae

Applied Physics Letters 117(16), 162903

Scale-free ferroelectricity induced by flat phonon bands in HfO2

Hyun-Jae Lee, Minseong Lee, Kyoungjun Lee, Jinhyeong Jo, Hyemi Yang, Yungyeom Kim, Seung Chul Chae, Umesh Waghmare, Jun Hee Lee

Science 369(6509), 1343

Complementary Resistive Switching and Synaptic-Like Memory Behavior in an Epitaxial SrFeO2.5 Thin Film through Oriented Oxygen-Vacancy Channels

Venkata Raveendra Nallagatla, Jihun Kim, Kyoungjun Lee, Seung Chul Chae, Cheol Seong Hwang, Chang Uk Jung

ACS Applied Materials & Interfaces 12(37), 41740

Dynamic analysis of non-linear wake-up behavior in Hf0.7Zr0.3 O2 thin film

Jong Chan Choi, Myeong Seop Song, Kyoungjun Lee, Kunwoo Park, Jungwon Park, Hyun-Jae Lee, Jun Hee Lee, Seung Chul Chae

Current Applied Physics 20(6), 746

Ferroelectricity in SrTiO 3 epitaxial thin films via Sr-vacancy-induced tetragonality

Kyeong Tae Kang, Hyun Il Seo, Owoong Kwon, Kyoungjun Lee, Jong-Seong Bae, Ming-Wen Chu, Seung Chul Chae, Yunseok Kim, Woo Seok Choi

Applied Surface Science 499, 143930

2019

Stable Subloop Behavior in Ferroelectric Si-Doped HfO2

Kyoungjun Lee, Hyun-Jae Lee, Tae Yoon Lee, Hong Heon Lim, Myeong Seop Song, Hyang Keun Yoo, Dong Ik Suh, Jae Gil Lee, Zhongwei Zhu, Alexander Yoon, Matthew R MacDonald, Xinjian Lei, Kunwoo Park, Jungwon Park, Jun Hee Lee, Seung Chul Chae

ACS Applied Materials & Interfaces 11(42), 38929

A room‐temperature ferroelectric ferromagnet in a 1D tetrahedral chain network

Kyeong Tae Kang, Chang Jae Roh, Jinyoung Lim, Taewon Min, Jun Han Lee, Kyoungjun Lee, Tae Yoon Lee, Seunghun Kang, Daehee Seol, Jiwoong Kim, Hiromichi Ohta, Amit Khare, Sungkyun Park, Yunseok Kim, Seung Chul Chae, Yoon Seok Oh, Jaekwang Lee, Jaejun Yu, Jong Seok Lee, Woo Seok Choi

Advanced Materials 31(24), 1808104

2018

Ferroelectric Polarization-Switching Dynamics and Wake-Up Effect in Si-Doped HfO2

Tae Yoon Lee, Kyoungjun Lee, Hong Heon Lim, Myeong Seop Song, Sang Mo Yang, Hyang Keun Yoo, Dong Ik Suh, Zhongwei Zhu, Alexander Yoon, Matthew R MacDonald, Xinjian Lei, Hu Young Jeong, Donghoon Lee, Kunwoo Park, Jungwon Park, Seung Chul Chae

ACS Applied Materials & Interfaces 11(3), 3142

Ferroelectricity in epitaxial Y-doped HfO2 thin film integrated on Si substrate

Kyoungjun Lee, Tae Yoon Lee, Sang Mo Yang, Dong Hoon Lee, Jungwon Park, Seung Chul Chae

Applied Physics Letters 112(20), 202901

2017

Large magnetoresistance in LaFeO 3 -substituted SrRuO 3 epitaxial thin films

Umasankar Dash, Susant Kumar Acharya, Seong Won Cho, Suyoun Lee, Kyoungjun Lee, Seung Chul Chae, Myung Rae Cho, Chang Uk Jung

Journal of Alloys and Compounds 724, 549

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