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Affiliates – Wonhee Ko

Prof. Wonhee Ko

[email protected]

Assistant professor of Physics, University of Tennessee, Knoxville

Research focus: Quantum Control and Measurement, e.g. spectroscopy, out of equilibrium quantum measurement and sensing, transport, and devices.



Wonhee Ko is an assistant professor of the Department of Physics and Astronomy, University of Tennessee, Knoxville. Previously, we was a postdoctoral research associate and R&D associate staff scientist in the Center for Nanophase Materials Sciences, Oak Ridge National Laboratory from 2017 to 2022, and a research staff member in Samsung Advanced Institute of Technology from 2012 to 2016. He received his Ph.D. degree in Applied Physics from Stanford University in 2012. His main research interest is finding new quantum phenomena in condensed matter systems with nanoscale microscopy, especially scanning tunneling microscopy (STM) which can resolve atomic and electronic structure of the matter in the atomic scale. By developing novel modality of STM, such as atom manipulation, functionalized probes, and multiprobe capability, the research provides highly versatile platform for quantum materials and quantum information sciences.

Research Description

We use scanning tunneling microscope to characterize and manipulate the quantum materials.

Recent research

1. M. S. Kavrik, J. Hachtel, W. Ko, C. Qian, A. Abelson, E. B. Unlu, H. Kashyap, A.-P. Li, J.-C. Idrobo, and M. Law, “Emergence of Distinct Electronic States in Epitaxially-Fused PbSe Quantum Dot Superlattices,” Nat. Commun. 13 6802 (2022).

2. W. Ko, J. L. Lado, and P. Maksymovych, “Non-contact Andreev reflection as a direct probe of superconductivity on the atomic scale,” Nano Lett. 22 4042 (2022).

3. W. Ko, Z. Gai, A. Puretzky, L. Liang, T. Berlijn, J. Hachtel, K. Xiao, P. Ganesh, M. Yoon, and A.-P. Li, “Understanding Heterogeneities in Quantum Materials (review paper),” Adv. Mater. 2106909 (2022).

4. W. Ko, E. F. Dumitrescu, and P. Maksymovych, “Statistical detection of Josephson, Andreev, and single quasiparticle currents in scanning tunneling microscopy,” Phys. Rev. Res. 3 033248 (2021).

5. W. Ko, M. Kolmer, J. Yan, A. D. Pham, M. Fu, F. Lüpke, S. Okamoto, Z. Gai, P. Ganesh, and A.-P. Li, “Realizing gapped surface states in magnetic topological insulator MnBi2-xSbxTe4,” Phys. Rev. B 102 115402 (2020).

Research Image

Atomic-scale characterization of quantum materials and realization of designer quantum states by combining scanning tunneling microscopy with novel modalities.