Professor KI, Dong-Keun

Current Research

• Experimental Condensed Matter and Material Science Group: Experimental Condensed Matter - Quantum Nanoelectronic Devices
  • We investigate quantum transport phenomena in various nano-electronic devices, realized by using state-of-art nano-fabrication and engineering techniques—the techniques that include electron-beam lithography, metal depositions and etching, micro-manipulation of atomically thin crystals and more. Materials of current interest are graphene and emerging 2D crystals, topological materials, and artificial heterostructures, and we take various experimental routes (e.g., rotating magnetic fields, inducing strain, etc) to discover or engineer new quantum effects in these systems. Since these effects are often fragile against finite temperature and electrical noises (e.g., fractional quantum Hall effect), we also implement cryogenic and low-noise measurement techniques. Throughout the investigation, we particularly aim to understand ‘and learn to control’ the underlying physical processes as it can not only expand our view of electronic materials but also bring us a step closer to the realization of new device applications. In this context, we are currently focusing on the topics below:
          (1) Quantum transport in graphene and 2D materials
          (2) ‘Designer’ electronic heterostructures and interfaces
          (3) New topological states of matter
          (4) Perovskite thermoelectrics

    
    More details can be found here

Research Interest

• Low-dimensional nano-electronics
• Quantum coherence and correlation effects
• Topological states
• Graphene and 2D materials
• Thermoelectric and energy materials

Representative Publications: Five Selected Publications

• Qing Rao, Wun-Hao Kang, Hongxia Xue, Ziqing Ye, Xuemeng Feng, Kenji Watanabe, Takashi Taniguchi, Ning Wang, Ming-Hau Liu*, and Dong-Keun Ki*, “Ballistic transport spectroscopy of spin-orbit-coupled bands in monolayer graphene on WSe2”, Nature Commun. 14, 6124 (2023)
• Heekwon Lee, Zhuoran Wang, Qing Rao, Sanghyeon Lee, Xiao Huan, Yu Liu, Jihyuk Yang, Mojun Chen, Dong-Keun Ki*, and Jitae Kim*, “Additive Manufacturing of Thermoelectric Microdevices for Four-Dimensional Thermometry”, Adv. Mater. 35, 2301704 (2023) *Featured in a frontispiece
• Youngwoo Nam, Dong-Keun Ki, David Soler-Delgado, and Alberto F. Morpurgo, “A family of finite-temperature electronic phase transitions in graphene multilayers”, Science 362, 324 (2018)
• Youngwoo Nam, Dong-Keun Ki, David Soler-Delgado, and Alberto F. Morpurgo, “Electron-hole collision limited transport in charge-neutral bilayer graphene”, Nat. Phys. 13, 1207 (2017)
• Dong-Keun Ki, Vladimir I. Fal'ko, Dmitry A. Abanin, and Alberto F. Morpurgo, “Observation of Even Denominator Fractional Quantum Hall Effect in Suspended Bilayer Graphene” Nano Lett.14, 2135 (2014)
• View full list

Work Experience

Education