Department of Applied Physics
School of Advanced Science and Engineering
P Takashi Mizokawa mizokawa at waseda.jp
M2 Shun Iwasaki
M2 Youhei Okamoto
M2 Tsubasa Yoshino
M2 Kento Yamamoto
M1 Mizuki Maeda
M1 Ryoya Matsumoto
M1 Hajime yagihara
B4 Tomohiro Morita
B4 Kifu Kurokawa
B4 Yu Saito
B4 Takumi Mitsuoka
B4 Yu Matsuzawa
B4 Kota Murota
Address: 55N-309A, Nishiwaseda campus, Waseda University
3-4-1 Okubo, Shinjuku-ku, Tokyo 169-8555, Japan
Inhomogeneous electronic states associated with charge-orbital order/disorder in probed by photoemission spectromicroscopy,
T. Yoshino, K. Wakita, E. Paris, A. Barinov, T. Kajita, T. Katsufuji, V. Kandyba, T. Sugimoto, T. Yokoya, N. L. Saini, and T. Mizokawa,
Phys. Rev. B 96, 115161 (2017).
Electronic structure and polar catastrophe at the surface of studied by angle-resolved photoemission spectroscopy,
Y. Okamoto, R. Matsumoto, T. Yagihara, C. Iwai, K. Miyoshi, J. Takeuchi, K. Horiba, M. Kobayashi, K. Ono, H. Kumigashira, N. L. Saini, and T. Mizokawa
Phys. Rev. B 96, 125147 (2017).
Photoelectrons are emitted from solid surfaces on which ultraviolet or x-ray light is shone.
By measuring the energy and momentum of the photoelectrons, we can study occupied states
of the solid (photoemission spectroscopy). On the other hand, we can study unoccupied states
of the solid by detecting light emitted from surfaces of the solid on which electrons are shone
We have been developing a high-energy-resolution inverse-photoemission system based on
dispersion matching of light and electron. Using the photoemission and inverse-photoemission
experiments, we have been studying the electronic structure of bulk and surface of various solids.
In particular, we are interested in transition-metal compounds that show rich physical properties
such as ferromagnetism, superconductivity, valence transition, and metal-insulator transition.
In transition-metal compounds, d-electrons with spin, charge and orbital degrees of freedom
are affected by complicated lattice distortions, and show interesting electric and magnetic properties.
We have been studying the relationship between the physical properties and electronic structure of
transition-metal compounds using experimental methods such as photoemission and inverse-
photoemission spectroscopy and theoretical methods such as unrestricted Hartree-Fock calculation.
As for new aspects of transition-metal compounds, an interesting question is what kind of
new electronic states are realized when d-electrons are confined at solid surface/interface.
Another interesting question is how confined d-electrons behave when perturbed by photons.
We are trying to answer these questions by studying thin films and nano particles of
various transition-metal compounds under laser illumination. Hopefully, the research
projects along this line would contribute to development of new optical and energy devices.
Figure：Dispersion matching for inverse-photoemission spectroscopy