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Quantum Materials Science Laboratory

Staff & Contact

Educational Staff Prof. Hisao Yanagi
Associate Prof. Hiroyuki Katsuki
Assistant Prof. Atsushi Yamashita
Assistant Prof.Hitoshi Mizuno
Contact TEL: +81-743-72-6011
URL /LABs/optics/eng/index-e.html

Education and Research Activities in the Laboratory

Electrons, when confined in a nanometer-sized space (1 nanometer = 10-9 m), remarkably begin to behave like waves. For example, an organic molecule can be considered as a quantum state in which electrons are confined in a nm space consisting of atoms connected together. Semiconductor nanoparticles show colors different from those of bulk solids due to this quantum size effect.

The Quantum Materials Science Laboratory studies molecules, crystals, nanoparticles, and ultrathin films of both organic and inorganic materials, utilizes various optics-based experimental approaches to clarify material properties from the viewpoint of quantum physics, and aims to create new functional materials that will be used in optical information-communication or environment-conscious devices in the future.

Research Theme

1. Molecular electronics and photonics

By controlling molecular alignment and crystal growth, we develop efficient light-emitting materials such as nanowires, microrings and microdots specifically aiming to realize organic lasers.

2. Coherent control in various quantum systems

Using ultrafast lasers, we are attempting to observe and control quantum coherence in various quantum systems, such as polaritons in a microcavity, ro-vibrational states in solid para-H2, and coherent phonons in organic crystals.

3. Photo-physical properties of nanostructured materials

We are working on optical functionality of nanostructured materials such as environment-conscious nanoparticles and impurity-doped nanoparticles.

Explanatory Pictures of Research Activities

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Fig.1 A molecular crystal-based organic laser
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Fig. 2 Targets of coherent control
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Fig.3 Luminescence from impuritydoped semiconductor nanoparticles

Recent Research Papers and Achievements

  1. H. Yanagi, F. Sasaki, and K. Yamashita, Adv. Opt. Mater. 7, 1900136 (2019).
  2. N. Kurahashi, V.-C. Nguyen, F. Sasaki, and H. Yanagi, Appl. Phys. Lett. 113, 011107 (2018).
  3. H. Katsuki, N. Takei, C. Sommer, and K. Ohmori, Acc. Chem. Res. 51, 1174 (2018).
  4. H. Katsuki, K. Ohmori, T. Horie, H. Yanagi, and K. Ohmori, Phys. Rev. B 92, 094511 (2015).
  5. A. Ishizumi, S. Fujita, and H. Yanagi, Opt. Mater. 33, 1116 (2011).
  6. H. Mizuno, K. Nagano, S. Tomita, H. Yanagi, and I. Hiromitsu, Thin Solid Films 654, 69 (2018).