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Research

Keywords

  • Experimental Condensed Matter Physics
  • Analog Universe
  • Quantum Hall Systems
  • General Relativity
  • Cryogenic Physics
  • Ultrafast Spectroscopy
  • GHz-compatible Circuits
  • Quantum Measurements, etc.

Ph.D. Research (Apr. 2024 ~ Present)

  • Extended the number of coaxial cables from the M.Sc. Research’s setup.
  • Implemented the pulse picking technique to extend the measurement time available for time-resolved measurements.
  • Invented the semiconductor etching technique to introduce wide-range confinement potential to GaAs/AlGaAs devices.
  • Challenging observation of expanding quantum Hall edges to explore analog 1+1 dim. expanding spacetime linking condensed matter physics and general relativity, which may enable us to obtain clues on quantum gravity.

M.Sc. Research (Apr. 2022 ~ Mar. 2024)

  • Developed and operated an ultrafast spectroscopic measurement system using a dilution refrigerator (~40 mK) and a superconducting magnet (magnetic fields >10 T).
  • Visualized time- and space-resolved dynamics in quantum Hall systems using a custom confocal microscope, which captured path-controlled edges for the first time ever.
  • Fabricated GaAs/AlGaAs devices using semiconductor processing techniques, e.g., photolithography, wet etching, ohmic contact annealing, and thermal deposition.
  • Designed high-frequency PCBs (up to 10 GHz) using AutoCAD and SonnetLite for impedance matching.

Publications & Preprints

  1. Yunhyeon Jeong, Akinori Kamiyama, John N. Moore, Takaaki Mano, Ken-ichi Sasaki, Yuuki Sugiyama, Tokiro Numasawa, Masahiro Hotta and Go Yusa, "Direct observation of the transverse near field of an edge excitation and associated slow secondary dynamics in a fractional quantum Hall state", arXiv preprint arXiv:2605.21989 (2026).
  2. Yunhyeon Jeong, Akinori Kamiyama, John N. Moore, Takaaki Mano, Ken-ichi Sasaki, Yuuki Sugiyama, Tokiro Numasawa, Masahiro Hotta and Go Yusa, "Spatiotemporal imaging of gate-controlled multipath dynamics of fractional quantum Hall edge excitations", arXiv preprint arXiv:2603.29234 (2026).
  3. Quentin France, Yunhyeon Jeong, Akinori Kamiyama, Takaaki Mano, Ken-ichi Sasaki, Masahiro Hotta and Go Yusa, “Electrically Induced Bulk and Edge Excitations in the Fractional Quantum Hall Regime,” Phys. Rev. Lett. 135, 066203 (2025).

Presentations

  1. Keita Umemura, Yunhyeon Jeong, Takeshi Morimoto, Momoyo Enyama and Akira Ikegami, "Accelerating electron-beam trajectory calculations by combining analytical solutions with numerical calculations (解析解と数値計算の併用による電子線軌道計算の高速化)", The 82nd Annual Meeting of The Japanese Society of Microscopy, Oral, Sendai, May 2026 (link; based on R&D conducted during my internship at Hitachi, in collaboration with Hitachi, Ltd. and Hitachi High-Tech Corporation).
  2. Taiki Karezaki, Yunhyeon Jeong, John N. Moore, Masahiro Hotta, Takashi Takayanagi, Takaaki Mano and Go Yusa, "Bulk and edge excitations in quantum Hall systems toward an analog wormhole (アナログワームホールに向けた量子ホールバルク・エッジ励起)", JPS 2026 Spring Meeting, Oral, online, Mar. 2026 (link).
  3. Yunhyeon Jeong, Masahiro Hotta, Takaaki Mano and Go Yusa, "Long-Range Deformation of Localized Edge States Induced by Spatial Potential Gradient (ポテンシャル空間勾配による局在エッジ状態の長距離変形)", JPS 2026 Spring Meeting, Oral, online, Mar. 2026 (link).
  4. John N. Moore, Yunhyeon Jeong, Takaaki Mano and Go Yusa, "False vacuum decay in the fractional quantum Hall liquid", The 5th Annual Meeting of the Extreme Universe Collaboration, Poster, Matsuyama, Japan, Dec. 2025 (link).
  5. Taiki Karezaki, Yunhyeon Jeong, John N. Moore, Masahiro Hotta, Takashi Takayanagi, Takaaki Mano and Go Yusa, "Observation of bulk excitations in the fractional quantum Hall system", The 5th Annual Meeting of the Extreme Universe Collaboration, Poster, Matsuyama, Japan, Dec. 2025 (link).
  6. Yunhyeon Jeong, Masahiro Hotta, Takaaki Mano and Go Yusa, "Challenge for Expansion of Quantum Hall Edge Universe", The 5th Annual Meeting of the Extreme Universe Collaboration, Poster, Matsuyama, Japan, Dec. 2025 (Poster Award, link).
  7. Yunhyeon Jeong, Masahiro Hotta, Takaaki Mano and Go Yusa, "Challenge for Expansion of Quantum Hall Edge Universe", The 4th young researchers' workshop of the Extreme Universe Collaboration & The 7th "Extreme Universe" School, Oral, Aichi, Japan, Jul. 2025 (link).
  8. Yunhyeon Jeong, Masahiro Hotta, Takaaki Mano and Go Yusa, "膨張する量子ホールエッジの現在と課題", 場の理論の新しい計算方法2024, Oral, The University of Tokyo, Dec. 2024 (link).
  9. Yunhyeon Jeong, Masahiro Hotta, Takaaki Mano and Go Yusa, “Analog Universe Expansion using Quantum Hall Edges”, Quantum Extreme Universe: Matter, Information, and Gravity, Oral, OIST, Japan, Oct. 2024 (link).
  10. Yunhyeon Jeong, Masahiro Hotta, Takaaki Mano and Go Yusa, “Analog Universe Expansion using Quantum Hall Edges”, The 4th Annual Meeting of the Extreme Universe Collaboration, Poster, Osaka University, Japan, Sep. 2024 (link).
  11. Yunhyeon Jeong, Masahiro Hotta, Takaaki Mano and Go Yusa, “Spacetime Structure of Expanding Quantum Hall Edges (膨張する量子ホールエッジの時空構造)”, JPS 2024 Annual Meeting, Oral, Hokkaido University, Sep. 2024 (link).
  12. Yunhyeon Jeong, Masahiro Hotta, Takaaki Mano and Go Yusa, “Analog Universe Expansion using Quantum Hall Edges”, The 3rd young researchers' workshop of the Extreme Universe Collaboration & The 6th "Extreme Universe" School, Poster, Otaru, Japan, Sep. 2024 (link).
  13. Yunhyeon Jeong, Masahiro Hotta, Takaaki Mano and Go Yusa, “Analog Universe Expansion using Quantum Hall Edges”, The 3rd young researchers' workshop of the Extreme Universe Collaboration & The 6th "Extreme Universe" School, Oral, Otaru, Japan, Sep. 2024 (link).
  14. Yunhyeon Jeong, Masahiro Hotta, Takaaki Mano and Go Yusa, “Deformation and Dynamics of Quantum Hall Edges,” ICPS 2024, Oral, Ottawa, Canada, Aug. 2024 (link).
  15. Yunhyeon Jeong, Masahiro Hotta, Takaaki Mano and Go Yusa, “Imaging of deformation of quantum Hall edges for analog universe experiments”, The 2nd young researchers' workshop of the Extreme Universe Collaboration, Oral, Shiga, Japan, Feb. 2024 (link).
  16. Yunhyeon Jeong, Masahiro Hotta, Takaaki Mano and Go Yusa, “Observation of Expanding and Contracting Quantum Hall Edges for Analog Universe Experiments”, 12th Workshop on Semiconductor/Superconductor Quantum Coherent Effect and Quantum Information, Poster, Nasu, Japan, Sep. 2023 (link).
  17. Yunhyeon Jeong, Masahiro Hotta, Takaaki Mano and Go Yusa, “Observation of Expanding and Contracting Quantum Hall Edges for Analog Universe Experiments (アナログ宇宙実験へ向けた量子ホールエッジの膨張・収縮観察)”, JPS 2023 Annual Meeting, Oral, Tohoku University, Sep. 2023 (link).
  18. Yunhyeon Jeong, Masahiro Hotta, Takaaki Mano and Go Yusa, “Imaging of Static Movement of Quantum Hall Edges”, The 1st young researchers' workshop of the Extreme Universe Collaboration, Poster, Nagoya University, Japan, Feb. 2023 (link).
  19. Yunhyeon Jeong, Masahiro Hotta, Takaaki Mano and Go Yusa, “For Imaging of Expanding Edges in Quantum Hall systems ~Observation of Gradient of Electron Density near Edges in Quantum Hall Systems~”, The 2nd Annual Meeting of the Extreme Universe Collaboration, Poster, Kobe, Japan, Dec. 2022 (link).

Grants & Awards

  1. Poster Award at The 5th Annual Meeting of the Extreme Universe Collaboration 2025 (link)
  2. Marubun Foundation International Exchange Grant (2024) – Supported participation in ICPS 2024 (link)