59 citations · 155 across the 17 of their papers we have counts for
18 papers
Microscopic theory of spin-torque ferromagnetic resonance in nonmagnetic-metal/ferromagnetic-metal heterostructures
Takumi Funato, Takeo Kato
We develop a microscopic theory of spin-torque ferromagnetic resonance (ST-FMR) in nonmagnetic-metal/ferromagnetic-metal heterostructures. Tracing out the conduction-electron degre…
Theory of spin Seebeck effect activated by acoustic chiral phonons
Naoki Nishimura, Takumi Funato, Mamoru Matsuo +1
We theoretically explore the generation of spin current driven by a temperature gradient in a junction between a chiral insulator and a normal metal. Based on the gyromagnetic resp…
Chirality-induced Phonon-Spin Conversion at an Interface
Takumi Funato, Mamoru Matsuo, Takeo Kato
We consider spin injection driven by nonequilibrium chiral phonons from a chiral insulator into an adjacent metal. Phonon-spin conversion arises from the coupling of the electron s…
Spin current generation due to differential rotation
Takumi Funato, Shunichiro Kinoshita, Norihiro Tanahashi +2
We study nonequilibrium spin dynamics in differentially rotating systems, deriving an effective Hamiltonian for conduction electrons in the comoving frame. In contrast to conventio…
Microscopic Analysis of Lattice Distortion Effects in Rashba Systems
Yuuki Ogawa, Takumi Funato, Hiroshi Kohno
We theoretically study the effects of dynamical lattice distortion in a three-dimensional Rashba system based on a tight-binding model. Considering an -electron system on a tet…
Curvature-induced valley-dependent spin-orbit interaction
A. Yamakage, T. Sato, R. Okuyama +5
We construct a general theoretical framework for describing curvature-induced spin-orbit interactions on the basis of group theory. Our theory can systematically determine the emer…
Majorana Spin Current Generation by Dynamic Strain
Yuki Yamazaki, Takumi Funato, Ai Yamakage
Majorana fermions that emerge on the surface of topological superconductors are charge neutral but can have higher-rank electric multipoles by allowing for account time-reversal an…
Spin hydrodynamic generation in unsteady flows
Takumi Funato, Mamoru Matsuo
We theoretically investigate a spin-mediated conversion from fluid dynamics to voltage, known as spin hydrodynamic generation (SHDG), in oscillatory and transient unsteady flows. W…
Acoustic spin current generation in superconductors
Takumi Funato, Ai Yamakage, Mamoru Matsuo
We theoretically study the generation of spin current due to a surface acoustic wave (SAW) in a superconductor. We model an s-wave superconductor as the mean-field Hamiltonian and…
Quantum Transport in Spin-1 Chiral Fermion: Self-Consistent Born Approximation
Risako Kikuchi, Takumi Funato, Ai Yamakage
Quantum transport for a spin-1 chiral fermion is studied within the self-consistent Born approximation. We find characteristic properties around zero energy, i.e., the peak structu…
Spin Pumping into Anisotropic Dirac Electrons
Takumi Funato, Takeo Kato, Mamoru Matsuo
We study spin pumping into an anisotropic Dirac electron system induced by microwave irradiation to an adjacent ferromagnetic insulator theoretically. We formulate the Gilbert damp…
Quantum transport of a spin-1 chiral fermion
Risako Kikuchi, Takumi Funato, Ai Yamakage
We theoretically study the quantum transport in a three-dimensional spin-1 chiral fermion system in the presence of impurity scattering. Within the self-consistent Born approximati…
Spin elastodynamic motive force
Takumi Funato, Mamoru Matsuo
The spin-motive force (SMF) in a simple ferromagnetic monolayer caused by a surface acoustic wave is studied theoretically via spin-vorticity coupling (SVC). The SMF has two mechan…
Acoustic Rashba-Edelstein effect
Takumi Funato, Mamoru Matsuo
We theoretically study the mechanical induction of the spin density via the Rashba spin--orbit interaction (SOI). The spin density in the linear response to lattice distortion dyna…
Helicity current generation by distorted Rashba coupling
Takumi Funato, Mamoru Matsuo
We theoretically study spin transport in two-or three-dimensional Rashba systems dynamically distorted by surface acoustic waves. The spin currents in the linear response to lattic…
Acoustic spin Hall effect in strong spin-orbit metals
Takuya Kawada, Masashi Kawaguchi, Takumi Funato +2
We report on the observation of the acoustic spin Hall effect that facilitates lattice motion induced spin current via spin orbit interaction (SOI). Under excitation of surface aco…
Extrinsic spin Hall effect in inhomogeneous systems
T. Funato, H. Kohno
Charge-to-spin conversion in inhomogeneous systems is studied theoretically. We consider free electrons subject to impurities with spin-orbit interaction and with spatially modulat…
Generation of Spin Current from Lattice Distortion Dynamics: Spin-Orbit Routes
Takumi Funato, Hiroshi Kohno
Generation of spin current from lattice distortion dynamics in metals is studied with special attention on the effect of spin-orbit coupling. Treating the lattice distortion by loc…