Osada group aims to search, elucidate, and manipulate novel electronic states, topological phenomena, and quantum transport, in two-dimensional materials (atomic layers), topological materials, and artificial nanostructures. This is achieved through electric and thermoelectric transport measurements conducted under strong magnetic fields, low temperatures, and high-pressure environments and also theoretical consideration. Recently, our research has focused on topological electronic states (including symmetry-broken quantum Hall states and topological insulator/semimetal states) and topological transport phenomena (such as quantized thermoelectric Hall effect and nonlinear anomalous Hall effect) in organic Dirac fermion systems and τ-type organic conductors. We have also investigated quantum transport in twisted bilayer graphene and ultrathin films of black phosphorus (such as moire weak localization), as well as the quantum size effect through ultra-thinning on electronic properties of graphite (including magnetic-field-induced electronic phase transitions and quantum Sondheimer effect). We are also attempting to measure transport phenomena under pulsed ultra-high magnetic fields using radiofrequency technique.

Publications