Naoyuki Sugimoto

Intrinsic Versus Extrinsic Anomalous Hall Effect in Ferromagnets

A unified theory of the anomalous Hall effect (AHE) is presented for multiband ferromagnetic metals with dilute impurities. In the clean limit, the AHE is mostly due to extrinsic skew scattering. When the Fermi level is located around anticrossing of band dispersions split by spin-orbit interaction, the intrinsic AHE to be calculated ab initio is resonantly enhanced by its nonperturbative nature, revealing the extrinsic-to-intrinsic crossover which occurs when the relaxation rate is comparable to the spin-orbit coupling.

Quantum transport theory of anomalous electric, thermoelectric, and thermal Hall effects in ferromagnets

In ferromagnets, the spontaneous magnetization bears the Hall effect through the relativistic spin-orbit interaction. Similar effects also occur in thermoelectric and thermal transport phenomena. Their mechanism, if it is of the intrinsic or extrinsic origin, has been controversial for many decades. We present a unified theory of these Hall transport phenomena in ferromagnetic metals with dilute impurities at the zero temperature, in terms of a fully quantum-mechanical transport theory for multiband systems with the self-consistent

Field-induced metal-insulator transition and switching phenomenon in correlated insulators

T

Spin Hall effect of a conserved current : Conditions for a nonzero spin Hall current

-matrix approximation. This theory becomes exact with a single impurity and is appropriate for treating the dilute limit of the impurity concentration

Theory of Non-Equilibirum States Driven by Constant Electromagnetic Fields— Non-Commutative Quantum Mechanics in the Keldysh Formalism —

{n}_{\mathrm{imp}}

Spin-orbit echo

. With the Fermi energy

Gauge Covariant Formulation of the Wigner Representation through Deformation Quantization: Application to Keldysh Formalism with an Electromagnetic Field

{E}_{F}

Landau-Zener tunneling problem for Bloch states

and the spin-orbit interaction energy

Current control of systems with a Peierls distortion by magnetic field

{E}_{\mathrm{SO}}

Semiclassical Lattice Effects on Interband Tunneling of a Two-state System

being fixed