Mizokawa group

Department of Applied Physics

School of Advanced Science and Engineering

Waseda Unversity

 

Members:

P           Takashi Mizokawa       mizokawa at waseda.jp

D3         Daiki Ootsuki        ootsuki at issp.u-tokyo.ac.jp

D3         Takuya Sugimoto    sugimoto at issp.u-tokyo.ac.jp

D1         Tomohiro Noda       noda at issp.u-tokyo.ac.jp

M2        Kei Sawada          sawada at issp.u-tokyo.ac.jp

M2        Jun Komiyama       komiyama at issp.u-tokyo.ac.jp

M2        Masaya Takahashi   m_takahashi at issp.u-tokyo.ac.jp

M2        Yu Chiba            chiba at issp.u-tokyo.ac.jp

B4         Shun Iwasaki

B4         Hiroaki Enomoto

B4         Youhei Okamoto

B4         Tsubasa Yoshino

B4         Kento Yamamoto

 

Address: 55N-309A, Nishiwaseda campus, Waseda University

         3-4-1 Okubo, Shinjuku-ku, Tokyo 169-8555, Japan

 

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