Laboratory for Unobtainable Functional Oxides

언옵테이늄 연구실

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We are experimental condensed matter physics group at department of physics in UNIST (Ulsan National Institute of Science and Technology). Our main goal is searching for exotic quantum phenomena in condensed matter, such as unconventional superconductivity, topological phases, and quantum magnetism, as well as providing new functional materials, i.e. multiferroics and energy materials, for future applications. To accomplish our goals, we are synthesizing new quantum materials unobtainable in nature and controlling their ground states via Hamiltonian engineering.

Major research field

Quantum materials, light-matter interaction, spectroscopy, oxide heterostructures, new functional materials

Desired field of research

Quantum materials, light-matter interaction, spectroscopy, oxide heterostructures, new functional materials

Research Keywords and Topics

1. Exotic quantum phenomena in strongly correlated electron system
Chiral superconductivity and quantum magnetism
Topologically nontrivial magnetic states in oxides such as quantum anomalous Hall state and skyrmion.
Metal-insulator transition and unconventional spin-charge-orbital-lattice coupling

2. Light-matter interactions
Spectroscopic investigation on low-energy excitation and relevant emergent phenomena in strongly correlated and spin-orbit coupled systems
Band gap engineering on thin films and nano structures
New materials for smart window, transparent conductor, infrared/THz detection, and other light-related applications.

3. Functional materials design by atomic control
Development of new synthesize methodologies for desired multifunctionalities
Si-compatible functional oxides
Materials for energy application such as photovoltaics and solid oxide fuel cell.

Research Publications
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Advanced Materials, Room-temperature ferromagnetic insulating state in highly cation-ordered double perovskite Sr2Fe1+xRe1-xO6 films, C. H. Sohn, E. Skoropata, Y. Choi, X. Gao, A. Rastogi, A. Huon, M. A. McGuire, L. Nuckols, Y. Zhang, J. Freeland, D. Haskel, and H. N. Lee (2019)
Physical Review Letters, Strong spin-phonon coupling mediated by single ion anisotropy in the all-in–all-out pyrochlore magnet Cd2Os2O7, C. H. Sohn, C. H. Kim, L. J. Sandilands, N. T. M. Hien, S. Y. Kim, H. J. Park, K.W. Kim, S. J. Moon, J. Yamaura, Z. Hiroi, and T. W. Noh (2017)
Physical Review Letters, Optical spectroscopy studies of the Metal-insulator transition driven by all-in/all-out magnetic ordering in 5d pyrochlore Cd2Os2O7, C. H. Sohn, H. G. Jeong, H. Jin, S. Y. Kim, L. J. Sandilands, H. J. Park, K. W. Kim, S. J. Moon, D.-Y. Cho, J. Yamaura, Z. Hiroi, and T. W. Noh (2015)