Researches on structure and physical properties of van der Waals layered materials are conducted. Current topics under investigation are as follows:

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

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.