| Co-Investigator(Kenkyū-buntansha) |
TOKURA Yoshinori Faculty of Engineering, Professor, 大学院・工学系研究科, 教授 (30143382)
NAGAOSA Naoto Faculty of Engineering, Professor, 大学院・工学系研究科, 教授 (60164406)
MIYANO Kenjiro Research Center for Advanced Science and Technology, The University of Tokyo, professor, 先端科学技術研究センター, 教授 (90167677)
MIYASHITA Seiji Faculty of Engineering, Professor, 大学院・工学系研究科, 教授 (10143372)
KANODA Kazushi Faculty of Engineering, Professor, 大学院・工学系研究科, 教授 (20194946)
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| Research Abstract |
Electrons in certain solids have strong correlations due to the Coulomb and exchange interactions among them and the electron-lattice interaction. The objective of the Project was to understand the physics of novel phases brought about by the electron correlation and to open up a field of new electronics based on the phase transitions between these phases triggered by weak external stimuli ; among them is photo-excitation. The target materials cover transition metal oxides, organic solids, and semiconductors. Experimental data derived from various techniques including transport, magnetic, and thermal measurements, materials development, laser spectroscopy, and x-ray ellipsometry have been constantly interrogated by the theory group. A strong technical base has been established for high-quality crystal growth and for ultrafast optical spectroscopy ranging from THz to UV. The synergetic collaboration among the Project members have been essential in developing a field of materials science, in which one can discuss the low energy transport phenomena and high energy optical excitation on the common footing ; a particularly relevant aspect for the study of the strongly correlated electron systems. The list of our finding includes the photoinduced insulator-metal transition, the connection between the superconductivity and the metal-insulator transition, the orbital quanta (orbiton), and ultrafast photo-switching. These results will be the basis on which we can establish the electronics for the next generation.
The Project has well served as the worldwide center for the study of strongly correlated electron systems. In order to strengthen and extend our activity after the termination of the Project, Quantum-Phase Electronic Center has been established in the School of Engineering, The University of Tokyo in April, 2001.
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