International Research Laboratory DYNACOM

International research laboratory DYNACOM "Dynamic Control of Materials"
Photo des menbres du LIA


The IRL DYNACOM (Dynamic Control of Materials) is an international research laboratory between CNRS, the University of Tokyo and the University of Rennes, located on the Hongo campus in Tokyo, Japan. The Tokyo Institute of Technology, Tohoku University and Kyoto University in Japan, as well as the University of Nantes in France, are partners in the project. DYNACOM is led by Prof. S. Ohkoshi at the University of Tokyo and Prof. Eric Collet at the University of Rennes. This IRL, created in 2022, is the result of a long-standing collaboration between Japan and France, initiated in 1996 and consolidated by the establishment of an associated international laboratory "LIA IM-LED" between 2016 and 2021. The creation of the IRL DYNACOM  in 2022 aims to strengthen this collaboration and bring it to a higher level.

 The research activities are focused on the development of new material functionalities. The objective is to control these materials in non-equilibrium conditions by using light excitation and/or electric field to control various physical properties such as ferroelectricity, magnetism, conductivity or optical properties. This work will have potential applications in optical devices, memory, photonics, and energy conversion.

The IRL DYNACOM aims at developing different types of physical controls to drive ultra-fast, coherent and cooperative transformations of various materials. It is indeed possible to use various optical stimuli to act on materials with different types of excitations using UV, visible, infrared or terahertz light. Our objective is to develop new processes to improve the efficiency of materials in response to these external stimuli. Research topics include photoactive materials, multi-ferroic materials, insulator-metal transitions, charge transfer processes, electronic excitation processes, phononic control or cooperative processes induced by elastic deformation of the crystal lattice. These studies require a multi-scale approach in time and space, from the molecule to the material. The goal is to control matter on an ultra-fast time scale, less than a millionth of a millionth of a second, and ultra-small, in particular for nanomaterials.

This international cooperation benefits from the complementary expertise of the partners in the synthesis of innovative materials and the development of advanced methods to characterize, study and control the physical properties of materials in an ultrafast manner.

This IRL, attached to the INP (Physics) CNRS, involves more than twenty researchers and teacher-researchers in France and fifteen in Japan, as well as post-doctoral and doctoral students and master's students.

Research axes

The research focuses on 3 effects induced in materials by laser irradiation:

    - Ultrafast photoinduced phenomena: electronic vs structural dynamics
    - Control of the bistability of materials by the elastic field: towards non volatile memories
    - Switching of correlated materials by light or electric fields (THz): towards a high field physics.

The project takes advantage of the great complementarity of the partners in materials science, state-of-the-art experimental techniques and theory.