Researches on plasticity and dislocations in crystalline materials and physical properties of van der Waals layered quasicrystals are conducted. Current topics under investigation are as follows:

1. Synthesis and evaluation of van der Waals layered quasicrystals
2. Electronic properties of topological insulators
3. Electrical properties of dislocations in topological insulators
4. Plasticity and dislocations of semiconductors
5. Electrical and optical properties of dislocations in semiconductors

1. Y. Tokumoto, K. Hamano. S. Nakagawa, Y. Kamimura, S. Suzuki, R. Tamura, and K. Edagawa: “Superconductivity in a van der Waals layered quasicrystal”, Nat. Commun., 15 (2024) 1529.
2. Y. Tokumoto, K. Sugimoto, Y. Hattoria, and K. Edagawa: “Electronic transport properties of Pb(Bi1−xSbx)2(Te1−ySey)4 topological insulator”, J. Appl. Physn., 131 (2022) 185105.
3. H. Hamasaki, Y. Tokumoto, and K. Edagawa: “Conductive and non-conductive dislocations in Bi-Sb topological insulators”, J. Phys. Soc. Jpn., 89 (2020) 0237039.
4. Y. Hattori, Y. Tokumoto, and K. Edagawa: “Optimizing composition of Pb(Bi1−xSbx)2Te4 topological insulator to achieve a bulk-insulating state”, Phys. Rev. Mater., 1 (2017) 074201.
5. H. Hamasaki, Y. Tokumoto, and K. Edagawa: “Dislocation conduction in Bi-Sb topological insulators”, Appl. Phys. Lett., 110 (2017) 092105.