The University of Tokyo · Physics and Astronomy
Professor Naoto Nagaosa's research lab specializes in strongly correlated electron systems, topological quantum phenomena, and unconventional superconductivity, with a focus on emergent quantum states in low-dimensional and noncentrosymmetric materials. The lab explores the interplay between spin, charge, and lattice degrees of freedom, particularly in systems with broken time-reversal or spatial inversion symmetry, such as topological insulators, oxide superconductors, and 2D van der Waals heterostructures. Using advanced theoretical frameworks—including Berry phase geometry and gauge field theories—the lab aims to uncover the microscopic origins of anomalous transport, topological responses, and non-Fermi liquid behavior. Experimental collaborations are central to validating theoretical predictions, especially in the context of anomalous Hall effects, magnetochiral anisotropy, and quantum criticality in correlated oxides and transition metal dichalcogenides.
Figures are computed from collected data and may differ slightly.
The anomalous Hall effect (AHE) occurs in solids with broken time-reversal symmetry, typically in a ferromagnetic phase, as a consequence of spin-orbit coupling. Experimental and theoretical studies of the AHE are reviewed, focusing on recent developments that have provided a more complete framework for understanding this subtle phenomenon and have, in many instances, replaced controversy by clarity. Synergy between experimental and theoretical works, both playing a crucial role, has been at the
We study a version of the uniform resonating-valence-band state in which fermions and spinless bosons are coupled by a gauge field. We show that above the Bose-Einstein temperature, the boson inverse lifetime due to scattering by the gauge field is of order kT, which suppresses the condensation temperature and leads to a linear T resistivity. The Hall number is proportional to the hole density and temperature dependent. The single-particle spectral weight exhibits a continuum plus a broadened pe
Lack of spatial inversion symmetry in crystals offers a rich variety of physical phenomena, such as ferroelectricity and nonlinear optical effects (for example, second harmonic generation). One such phenomenon is magnetochiral anisotropy, where the electrical resistance depends on the current direction under the external magnetic field. We demonstrate both experimentally and theoretically that this magnetochiral anisotropy is markedly enhanced by orders of magnitude once the materials enter into
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