Professors

• · 2004-2007; Ph.D. in Electrical Engineering and Computer Science, University of Michigan, Ann Arbor
• · 2002-2004; M.S. in Electrical Engineering and Computer Science, University of Michigan, Ann Arbor
• · 1996-2002; B.S. in Electrical Engineering, Yonsei University

• · 2019.9-present; Associate Professor, Department of Physics and Astronomy, Seoul National University
• · 2018.3-2019.2; Visiting Professor, Department of Applied Physics and SLAC National Accelerator Laboratory, Stanford University
• · 2015.8-2019.8; Associate Professor, School of Electrical and Electronic Engineering, Yonsei University
• · 2011.3-2015.8; Assistant Professor, School of Electrical and Electronic Engineering, Yonsei University
• · 2008.1-2010.12; Postdoctoral Fellow, Lawrence Berkeley National Laboratory

Our group is interested in understanding and controlling the light-matter interactions in ultrafast time scales. We use the state-of-the-art ultrafast laser and nanofabrication technology to access, manipulate, and engineer novel properties of quantum condensed matters. Our group is specialized in ultrafast laser spectroscopy, ranging from the visible to the terahertz (THz) range.

1. J. Kim, C. Gollner, Y. Pleimling, S. Lee, K. Watanabe, T. Taniguchi, M-H. Jo, T. Heinz†, and H. Choi†, "Ultrafast moiré-resolved spectroscopy of interlayer exciton thermalization in twisted WSe2/WS2 heterobilayers," Physical Review Letters, accepted (2026)
2. C. In, S. Lee, D. Jain, S. Oh, M-H. Jo†, and H. Choi†, "Gate-controlled terahertz modulation in graphene-integrated Bi2Se3 microstructure," Nano Letters 25, 17733-17738 (2025)
3. C. Han*, M. Noh*, H. Park, J. Yoon, H. Cho, G. Moon, S. Y. Min, S. Lee, H. Chang, H. Choi†, and M-H. Jo†, "Terahertz non-Drude conductivity of mirror twin boundary networks on monolayer MoS2 bicrystals," Nano Letters 25, 14473-14480 (2025)
4. H. Choi*, J. Kim*, J. Park, J. Lee, W. Heo, J. Kwon, S-H. Lee, A. Faisal, K. Watanabe, T. Taniguchi, Z. Sun, M-H. Jo†, and H. Choi†, "Ultrafast Floquet engineering of Fermi-polaron resonances in charge-tunable monolayer WSe2 devices," Nature Communications 15, 10852 (2024)
5. J. Kim*, J. Park*, H. Choi, T. Kim, S. Cha, Y. W. Lee, K. Watanabe, T. Taniguchi, J. Kim, M-H. Jo, and H. Choi†, "Correlation-driven nonequilibrium exciton site transition in a WSe2/WS2 moiré supercell," Nature Communications 15, 3312 (2024)
6. J. Lee, J. Kwon, E. Lee, J. Park, S. Cha, K. Watanabe, T. Taniguchi, M.-H. Jo, and H. Choi†, "Spinful hinge states in the higher-order topological insulators WTe2," Nature Communications 14, 1801 (2023)