Osada, Toshihito

Biography

Transport study of low-dimensional electron system. To search for new phenomena in topological electron systems and electron systems confined by small spatial structures or strong magnetic fields, to clarify their mechanisms, and to control them for application. We have a great interest in quantum effects, topological effects, and many-body effects, which relate to Berry curvature of band structure, pseudo-spin degrees of freedom, and commensurability among electron orbital motions, vortex (magnetic flux) configuration, and spatial structures. Our targets are atomic layer materials such as graphene, low-dimensional materials such as organic conductors, and artificial semiconductor/superconductor nano-structures. We flexibly explore new transport phenomena and electronic states in small samples by electric, magnetic, and thermal measurements using fabrication techniques for building up atomic layer complexes (van derWaals heterostructures), nano-processing techniques like EB, precise field rotation, miniature pulse magnet, etc. under strong magnetic fields, high pressures, and low temperatures. Recently, we have concentrated our studies on quantum transport in atomic layer materials (graphene, phosphorene, etc.) and helical/chiral electron systems formed at the surface of topological phases.

Research Interest

Electronic structure and quantum transport in atomic layers (graphene, phosphorene, etc.) Helical surface state in quantum Hall ferromagnetic phase in an organic Dirac fermion system Quantum transport of chiral surface state in multilayer quantum Hall systems Interlayer coherence and angle-dependent magnetotransport in layered conductors Chaos and electron transport in Bloch electron systems under magnetic and electronic fields