Mizokawa group

Department of Applied Physics

School of Advanced Science and Engineering

Waseda Unversity

 

Members:

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 BaV10O15 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).

 

Orbital order and fluctuations in the two-leg ladder materials BaFe2X3 (X=S and Se) and CsFe2Se3 ,
Kou Takubo, Yuichi Yokoyama, Hiroki Wadati, Shun Iwasaki, Takashi Mizokawa, Teak Boyko, Ronny Sutarto, Feizhou He, Kazuki Hashizume, Satoshi Imaizumi, Takuya Aoyama, Yoshinori Imai, and Kenya Ohgushi, Phys. Rev. B 96, 115157 (2017).
 

Electronic structure and polar catastrophe at the surface of LixCoO2 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).

 

 

 

 

recent papersresearch projects

 

 

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

(inverse-photoemission spectroscopy).

 

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.

 

 

image002

FigureDispersion matching for inverse-photoemission spectroscopy