Postdoctorate Scholars
Dr. Makoto Hashimoto
I'm a postdoctoral fellow in Prof. Z.X. Shen's group. My current research interest is to understand electronic properties of strongly correlated materials especially high temperature superconductors. Current focuses is the ARPES measurements on detailed temperature dependence of the pseudogap and superconducting gap in different doping levels and materials. Before joining Shen group in April 2008, I did my Ph.D.work at the University of Tokyo. My Ph.D. thesis mainly focuses on the doping evolution of the electronic structure of the single-layer cuprates (Bi2201 and LSCO) using photoemission spectroscopy.
Dr. Patrick Kirchmann
I obtained my doctoral degree from the Freie Universität Berlin in 2009 for the study of "Ultrafast Electron Dynamics in Low-Dimensional Materials". My research within the SIMES collaboration is funded by the Alexander-von-Humboldt Foundation through a Feodor-Lynen stipend and focuses on ultrafast dynamic processes in solid state materials using pump-probe photoemission techniques directly in the time domain. I employ time- and angle-resolved photoemission spectroscopy to study collective excitations in strongly correlated electron systems. The strength of this approach is the complementary information that is obtained by the simultaneous measurement of (i) the single-particle spectral function in frequency space and (ii) many-body correlations in the time domain. Even more so, the introduction of spin resolution to the experimental setup will provide unique capabilities for the study of correlation effects in spin-ordered electronic structures such as topological insulators.
Dr. Keji Lai
I am currently a postdoctoral fellow in Prof. Z.X. Shen!/s group. I spent four years in Tsinghua University for my BS degree, and five years in Princeton University for my PhD degree, both in Electrical Engineering. My Ph.D. thesis focuses on the quantum transport in high mobility Si/SiGe 2D systems under intense magnetic fields and ultra-low temperatures. I also did experiments on cyclotron resonance at microwave frequencies in GaAs 2D hole systems. My current interest is to develop a new imaging technique, known as the near-field scanning microwave microscope. With the new configuration and tip design, local dielectric constant and conductivity can be imaged at an unprecedented high spatial resolution. Such technique is expected to provide important information on the physical properties of complex materials.
Dr. Sung-Kwan Mo
My research interest is to understand electronic properties of strongly correlated materials such as transition metal oxides and heavy fermion systems, using various spectroscopic tools such as photoemission, x-ray absorption and inelastic x-ray scattering. Current focus is the ARPES measurements of spectral changes across phase boundaries and novel ground states in the vicinity of quantum critical points. Before joining Shen group in September 2006, I did my Ph. D. work at the University of Michigan. The main focus of my thesis is to investigate Mott-Hubbard metal-insulator transitions, low dimensional electronic structures, and heavy fermion properties in various vanadium compounds using photoemission spectroscopy.
