Dr. Yujeong Bae

Group Leader Quantum Magnetism

Yujeong Bae is the Group Leader of the Quantum Magnetism group at the nanotech@surfaces Laboratory, focusing on investigating and engineering the quantum coherent functionalities of spin structures built on a surface with atomic precision. She joined Empa in 2024 and started establishing a lab dedicated to the precise construction and characterization of spin-based quantum structures with high spatial and energy resolutions using a low-temperature scanning tunneling microscope (STM) with electron spin resonance (ESR) capabilities.

Yujeong received her Bachelor's degree in Physics and Mathematics from Ewha Womans University in 2010. She continued her academic journey at the same university, completing her Ph.D. in Physics in 2016 with a thesis project on spin transport in hybrid organic spintronic devices. Transitioning her research field towards the smallest conceivable spin device with special focus on the quantum dynamics, she joined the Center for Quantum Nanoscience (QNS) and IBM Almaden Research Center as a postdoctoral researcher. After three years, she became a Group Leader at the QNS and a research professor at Ewha Womans University.

Yujeong brings extensive expertise in ultra-high vacuum systems for ultra-thin organic/inorganic film growth and in a low-temperature spin-polarized STM with a dilution refrigerator and a Joule-Thomson refrigerator. Her research, primarily conducted using ESR-STM, has focused on studying 3d and 4f electron spins, as well as nuclear spins carried by individual atoms/molecules on a surface. Her scientific contributions include demonstrating the atomic clock transition in precisely engineered atomic structures, exploring hyperfine interactions of single atoms, achieving coherent manipulation of single- and multiple-electron qubits built atom by atom, and functionalizing the STM tip apex for atomic-scale quantum sensing.

Fields of interest

Quantum nanoscience, Quantum information processing, Quantum sensing, Quantum simulation, Scanning tunneling microscopy, Atom manipulation, Surface science

Selected publications

Y. Wang, Y. Chen, H. T. Bui, C. Wolf, M. Haze, C. Mier, J. Kim, D.-J. Choi, C. P. Lutz, Y. Bae, S. Phark, A. J. Heinrich, An atomic-scale multi-qubit platform, Science 382, 87-92 (2023). DOI: 10.1126/science.ade5050

J. Hwang, D. Krylov, R. Elbertse, S. Yoon, T. Ahn, J. Oh, L. Fang, W. Jang, F. H. Cho, A. J. Heinrich, Y. Bae, Development of a scanning tunneling microscope for variable temperature electron spin resonance, Rev. Sci. Instrum. 93, 093703 (2022). DOI: 10.1063/5.0096081

Y. Chen, Y. Bae, A. J. Heinrich, Harnessing the quantum behavior of spins on surfaces, Adv. Mater. 35, 2107534 (2022). DOI: 10.1002/adma.202107534

K. Yang, W. Paul, S. Phark, P. Willke, Y. Bae, T. Choi, T. Esat, A. Ardavan, A. J. Heinrich, C. P. Lutz, Coherent spin manipulation of individual atoms on a surface, Science 366, 509-512 (2019). DOI: 10.1126/science.aay6779

K. Yang, P. Willke, Y. Bae, A. Ferrón, J. L. Lado, A. Ardavan, J. Fernández-Rossier, A. J. Heinrich, C. P. Lutz, Electrically controlled nuclear polarization of individual atoms, Nat. Nanotechnol. 13, 1120-1125 (2018). DOI: 10.1038/s41565-018-0296-7

P. Willke, Y. Bae, K. Yang, J. L. Lado, A. Ferrón, T. Choi, A. Ardavan, J. Fernández-Rossier, A. J. Heinrich, C. P. Lutz, Hyperfine interaction of individual atoms on a surface, Science 362, 336-339 (2018). DOI: 10.1126/science.aat7047

Y. Bae, K. Yang, P. Willke, T. Choi, A. J. Heinrich, C. P. Lutz, Enhanced quantum coherence in exchange coupled spins via singlet-triplet transitions, Sci. Adv. 4:eaau4159 (2018). DOI: 10.1126/sciadv.aau4159