Background

My background is in condensed matter physics. I studied the electronic structures of scintillator materials and the electron’s spin structures on the surfaces of topological insulators. I also investigated the electron correlation in the f electron system in the rare earths and actinides.

Research Interests

I am very interested in radiochemical evaluations for the stockpile stewardship and post-detonation nuclear forensics missions.

Ph.D., Physics (Dr. Rer. Nat.), University of Bielefeld, Germany, 1999

M.S., Physics, University of Sung Kyun Kwan, Korea, 1991

B.S., Physics, University of Sung Kyun Kwan, Korea, 1988

1. Energy levels of the Ce activator relative to the YAP(Ce) scintillator host, S.-W. Yu, M. H. Carpenter, F. Ponce, S. Friedrich, J.-S. Lee, P. Olalde-Velasco, W. L. Yang, and D. Aberg, Journal of Physics: Condensed Matter 27, 185501 (2015).
2. Oxidation and crystal field effects in uranium, J. G. Tobin, S.-W. Yu, C. H. Booth, T. Tyliszczak, D. K. Shuh, G. van der Laan, D. Sokaras, D. Nordlund, T.-C. Weng, and P. S. Bagus, Physical Review B 92, 035111 (2015).
3. Covalency in oxidized uranium, J. G. Tobin, S.-W. Yu, R. Qiao, W. L. Yang, C. H. Booth, D. K. Shuh, A. M. Duffin, D. Sokaras, D. Nordlund, and T.-C. Weng, Physical Review B 92, 045130 (2015).
4. The effects of mesoscale confinement in Pu clusters and isolated particles, M. V. Ryzhkov, A. Mirmelstein, B. Delley, S.-W. Yu, B. W. Chung, and J. G. Tobin, J. Journal of Electron Spectroscopy and Related Phenomena 194, 45 (2014), Cover Article.
5. Inner-shell photoionization of atomic chlorine, W. C. Stolte, Z. Felfli, R. Guillemin, G. Ohrwall, S.-W. Yu, J. A. Young, D. W. Lindle, T. W. Gorczyca, N. C. Deb, S. T. Manson, A. Hibbert, and A. Z. Msezane, Physical Review A 88, 053425 (2013).
6. Probing actinide electronic structure through Pu cluster calculations, M. V. Ryzhkov, A. Mirmelstein, S.-W. Yu, B. W. Chung, and J. G. Tobin, International Journal of Quantum Chemistry 113, 1957 (2013), Cover Article.
7. Energy calibrations in the x-ray absorption spectroscopy of uranium dioxide, S.-W. Yu, J. G. Tobin, P. Olalde-Velasco, W. L. Yang, and W. J. Siekhaus, Journal of Vacuum Science and Technology A 30, 011402 (2012).
8. Orbital specificity in the unoccupied states of UO2 from resonant inverse photoelectron spectroscopy, J. G. Tobin and S.-W. Yu, Physical Review Letters 107, 167406 (2011).
9. f - f origin of the insulating state in uranium dioxide: x-ray absorption experiments and first-principles calculations, S.-W. Yu, J. G. Tobin, J. C. Crowhurst, S. Sharma, J. K. Dewhurst, P. Olalde Velasco, W. L. Yang, and W. J. Siekhaus, Physical Review B 83, 165102 (2011).