Education and Career
2010 Bachelor of Science, Kyoto University, Japan
2015 PhD in Science, Kyoto University, Japan
2015-present Assistant professor, The Institute for Solid State Physics, The University of Tokyo, Japan
Research Interests
I am interested in elucidating unknown mechanisms behind phenomena related to light -matter interaction, especially ones that are potentially beneficial for society. My collaborators and I have investigated the underlying physics of the optical properties of pure diamond in both the low and high excitation regime. These studies revealed the origin of the unusual energetic structure of excitons in diamond and the crucial role of the nonequilibrium character of the photoexcited carriers in the macroscopic state at low temperatures. I am presently interested in a variety of systems ranging from semiconductor devices to biological materials.
Original papers
1. Yuji Hazama, Nobuko Naka, and Heinrich Stolz
Mass-anisotropy splitting of indirect excitons in diamond
Phys. Rev. B 90, 045209 (2014)

Why do excitons in diamond have fine structures in their energy levels? We tackled this question and revealed that the anisotropy of the effective mass of electrons is playing a crucial role.

2.Yuji Hazama, Nobuko Naka, Makoto Kuwata-Gonokami and Koichiro Tanaka
Resonant creation of indirect excitons in diamond at the phonon-assisted absorption edge
EPL 104 47012 (2013)

In this work, we proposed and evaluated a new photo-excitation method to create a many-body system with cold and dense electrons and holes in diamond. We also determined fundamental quantities of free excitons, such as their lifetime and inter-level relaxation time.