• Yoon Seok Oh (오윤석)

  • Associate Professor
  • Experimental Condensed Matter Physics
  • Current Research Interests

    Quantum Phase Transition
    Contrary to classical phase transition, quantum phase transition is induced by varying a physical control parameter, such as magnetic field, chemical doping, and pressure, etc., at absolute zero temperature. Our interest is focused on understanding of emergent phases (superconductivity, quantum spin systems) through studying of the quantum phase transitions.

    Multiferroics are materials which have more than one of the primary order parameters in the single phase. Cross coupling of non-conjugate parameters (magnetic field controlled electric polarization or electric field switchable magnetization) gives rise to intriguing physics. Our research lies on finding new multferroics, understanding/explaining their correlation, and developing practical multiferroic devices, such as multi-bits memory, highly-sensitive magnetic sensors, etc.

  • Biographical Sketch
    • B.S. in Physics (2004), Seoul National University, Korea
    • M.S. in Physics (2006), Seoul National University (Advisor : Prof. Kee Hoon Kim)
    • Ph.D. in Physics (2010), Seoul National University (Advisor: Prof. Kee Hoon Kim)
    • Postdoctoral researcher, Seoul National University (2010)
    • Postdoctoral research associate in the Group of Prof. Sang-Wook Cheong at Rutgers University (2010-2014)
    • Assistant Professor in Department of Physics, UNIST (2014 – )
  • Selected Publications
    1. Nature Materials 14, 407 (2015), “Experimental demonstration of hybrid improper ferroelectricity and presence of abundant charged walls in (Ca,Sr)3Ti2O7 crystals”, Yoon Seok Oh, X. Luo, F.-T. Huang, Y. Wang, and S.-W. Cheong.
    2. Nature Communications 5, 3201 (2014), “Non-hysteretic colossal magnetoelectricity in a collinear antiferromagnet”, Yoon Seok Oh, Sergey Artyukhin, Jun Jie Yang, Vivien Zapf, Jae Wook Kim, David Vanderbilt, and Sang-Wook Cheong.
    3. Physical Review Letters 110, 127209 (2013), “Anionic Depolymerization Transition in IrTe2”, Yoon Seok Oh, J. J. Yang, Y. Horibe, and S.-W. Cheong.
    4. Physical Review Letters 108, 116402 (2012), “Charge-Orbital Density Wave and Superconductivity in the Strong Spin-Orbit Coupled IrTe2:Pd”, J. J. Yang, Y. J. Choi, Y. S. Oh, A. Hogan, Y. Horibe, K. Kim, B. I. Min, and S-W. Cheong.
    5. Physical Review B 83, 060405(R) (2011), “Strong magnetoelastic effect on the magnetoelectric phenomena of TbMn2O5”, Yoon Seok Oh, Byung-Gu Jeon, S. Y. Haam, S. Park, V. F. Correa, A. H. Lacerda, S.-W. Cheong, Gun Sang Jeon, and Kee Hoon Kim.
    6. Applied Physics Letters 97, 052902 (2010), “Quantitative determination of anisotropic magnetoelectric coupling in BiFeO3–CoFe2O4 nanostructures”, Yoon Seok Oh, S. Crane, H. Zheng, Y. H. Chu, R. Ramesh, and Kee Hoon Kim.
    7. Physical Review Letters 102, 147002 (2009), “Observation of the Josephson Effect in Pb/Ba1-xKxFe2As2 Single Crystal Junctions”, Xiaohang Zhang, Yoon Seok Oh, Yong Liu, Liqin Yan, Kee Hoon Kim, Richard L. Greene, and Ichiro Takeuchi.
    8. Physical Review Letters 98, 016401 (2007), “Interplay between Fermi Surface Topology and Ordering in URu2Si2 Revealed through Abrupt Hall Coefficient Changes in Strong Magnetic Fields”, Y. S. Oh, Kee Hoon Kim, P. A. Sharma, N. Harrison, H. Amitsuka, and J. A. Mydosh.