Research

산화물 및 양자 박막 연구실은 원자 단위로 컨트롤된 고품질의 에피 산화물 박막을 성장하고, 새로운 양자 현상 및 강상관계 특성을 탐구하는 연구를 수행합니다. 나아가, 이온 게이팅 (ionic gating) 등을 이용하여 박막의 전기적/자기적/광학적/초전도 특성을 전기적으로 제어가 가능한 차세대 이온트로닉스 (iontronics) 소재/소자에 관한 연구를 진행합니다. 뿐만 아니라, 모트 전이 (Mott transition), 초전도성 (superconductivity), 강유전성 (ferroelectrics), 강자성 (ferromagnetism), 다강성 (multiferroics), 자전기성 (magnetoelectrics) 등의 양자 소재/소자 개발에 관한 연구를 진행 중이며, 이는 미래 반도체 기술에 이용될 수 있는 핵심적인 연구 주제입니다. 주요 연구 분야는 다음과 같습니다.

References:

• H. Han* et al., “Li iontronics in single-crystalline T-Nb2O5 thin films with vertical ionic transport channels” Nature Materials 22, 1128-1135 (2023)

• H. Han* et al., “Strain-driven formation of epitaxial nanostructures in brownmillerite strontium cobaltite thin film” Proc. Nat. Acad. Sci. USA. (PNAS) 120, e2221651120 (2023)

• H. Han* et al., “Anti-phase boundary accelerated exsolution of nanoparticles in non-stoichiometric perovskite thin films” Nature Communications 13, 6682 (2022)

• H. Han et al.,* “Lattice Strain-Enhanced Exsolution of Nanoparticles in Thin Films” Nature Communications 10, 1471 (2019)

References:

• H. Han* et al., “Reversal of Anomalous Hall Effect and Octahedral Tilting in SrRuO3 Thin Films via Hydrogen Spillover” Advanced Materials 35, 2207246 (2023)

• S. Song†, H. Han†, et al., “Implementing Room-Temperature Multiferroism by Exploiting Hexagonal-Orthorhombic Morphotropic Phase Coexistence in LuFeO3 Thin Films” Advanced Materials 28, 7430–7435 (2016).

• D. Kim, H. Han, J. H. Lee, J. W. Choi, J. C. Grossman, H. M. Jang,* D. Kim,* “Electron-Hole Separation in Ferroelectric Oxides for Efficient Photovoltaic Responses” Proc. Nat. Acad. Sci. USA (PNAS) 115, 6566-6571 (2018).

References:

• H. Han* et al., “Li iontronics in single-crystalline T-Nb2O5 thin films with vertical ionic transport channels” Nature Materials 22, 1128-1135 (2023)

•  Y. Guan†, H. Han†, G. Li, F. Li, S. S. P. Parkin,* “Ionic Gating for Tuning Electronic and Magnetic Properties” Annual Review of Materials Research 53, 25-51 (2023).

• H. Han* et al., “Reversal of Anomalous Hall Effect and Octahedral Tilting in SrRuO3 Thin Films via Hydrogen Spillover” Advanced Materials 35, 2207246 (2023)

• H. Han et al., “Control of oxygen vacancy ordering in brownmillerite thin films via ionic liquid gating” ACS Nano 16, 6206−6214 (2022)

• H. Han* et al., “Strain-driven formation of epitaxial nanostructures in brownmillerite strontium cobaltite thin film” Proc. Nat. Acad. Sci. USA. (PNAS) 120, e2221651120 (2023)

References:

• H. Han et al., “All-Oxide Metasurfaces Formed by Synchronized Local Ionic Gating” Advanced Materials 2401064 (2024) (doi.org/10.1002/adma.202401064)

• K.-R. Jeon et al., “Zero-field polarity-reversible Josephson supercurrent diodes enabled by a proximity-magnetised Pt barrier” Nature Materials 21, 1008-1013 (2022)

• H. Han, S. Song, J. H. Lee, K. J. Kim, G.-W. Kim, T. Park, H. M. Jang,* “Switchable Photovoltaic Effects in Hexagonal Manganite Thin Films having Narrow Band Gaps” Chemistry of Materials 27, 7425 (2015).

• S. Song†, H. Han†, H. M. Jang,* Y. T. Kim, N.-S. Lee, C. G. Park, J. R. Kim, T. W. Noh, J. F. Scott, “Implementing Room-Temperature Multiferroism by Exploiting Hexagonal-Orthorhombic Morphotropic Phase Coexistence in LuFeO3 Thin Films”  Advanced Materials 28, 7430–7435 (2016).