Research areas	Photoemission spectroscopy of high-Tc superconductors and strongly correlated electron systems
Keywords	strongly correlated electron systems, high-Tc superconductivity, angle-resolved photoemission spectroscopy
Themes	Our laboratory is dedicated to unraveling the intriguing properties of strongly correlated electron systems, including high-temperature superconductors. More than 35 years have passed since the discovery of cuprate high-temperature superconductors, yet the mechanism behind superconductivity remains one of the great unsolved mysteries. These materials exhibit rich and complex behaviors—such as metal-to-insulator transitions—arising from strong Coulomb interactions between electrons and strong coupling between electrons and lattice vibrations. One of the most powerful techniques to approach this mystery is photoemission spectroscopy. By using light to directly extract electrons from inside a solid and analyzing their energy and momentum, we can observe the electronic band structure, Fermi surfaces, and superconducting gaps. Among such methods, angle-resolved photoemission spectroscopy (ARPES) is one of the most direct ways to “see” the electronic states. In our laboratory, we make use of both synchrotron radiation facilities and in-house light sources, aiming to clarify the underlying mechanisms that give rise to phenomena such as high-temperature superconductivity, metal–insulator transitions, and orbital order through photoemission spectroscopy.
Major publications	[1]M. Nagamoto, D. Ootsuki, T. Yoshida et al., "Revisiting the chemical potential shift in La2-xSrxCuO4 by means of hard and soft x-ray photoemission spectroscopy", Phys. Rev. B 110, 115150 (2024). [2] S. Yamamoto, D. Ootsuki, T. Yoshida et al., "Observation of a Pseudogap in the Vicinity of the Metal-Insulator Transition in the Perovskite-type Vanadium Oxides Nd1-xSrxVO3", J. Phys. Soc. Jpn. 87, 024708 (2018). [3] S. Aizaki, T. Yoshida et al., “Self-Energy on the Low- to High-Energy Electronic Structure of Correlated Metal SrVO3”, Phys. Lev. Lett. 109, 056401 (2012). [4] T. Yoshida et al, “Systematic doping evolution of the underlying Fermi surface of La2-xSrxCuO4”, Phys. Rev. B 74, 224510 (2006). [5] T. Yoshida et al, “Metallic Behavior of Lightly Doped La2-xSrxCuO4 with a Fermi Surface Forming an Arc”, Phys. Rev. Lett. 91, 027001 (2003).
Professional societies/Research and synergic activities
Teaching Areas	Undergraduate courses Graduate courses (Master's program) Graduate courses (Doctor's program) Undergraduate courses open to all departments
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