67 citations · 161 across the 17 of their papers we have counts for
17 papers
Anisotropy of the spin Hall effect in a Dirac ferromagnet
Guanxiong Qu, Masamitsu Hayashi, Masao Ogata +1
We study the intrinsic spin Hall effect of a Dirac Hamiltonian system with ferromagnetic exchange coupling, a minimal model combining relativistic spin-orbit interaction and ferrom…
Electron Hydrodynamics by Spin Hall Effect
Junji Fujimoto, Wataru Koshibae, Sadamichi Maekawa
Electron hydrodynamics is currently known to emerge only when electron-electron interaction dominates over the momentum-nonconserving scatterings of electrons, where the electron t…
Field theoretical approach to spin torques: Slonczewski torques
Junji Fujimoto
The quantum field theoretical approach with the Kubo formula has successfully captured spin torques, such as spin-transfer torques and spin-orbit torques, for continuum systems. We…
Spin Hall effect driven by the spin magnetic moment current in Dirac materials
Zhendong Chi, Guanxiong Qu, Yong-Chang Lau +5
The spin Hall effect of a Dirac Hamiltonian system is studied using semiclassical analyses and the Kubo formula. In this system, the spin Hall conductivity is dependent on the defi…
Chirality-dependent second-order spin current in systems with time-reversal symmetry
Ryosuke Hirakida, Junji Fujimoto, Masao Ogata
Spin currents proportional to the first- and second-order of the electric field are calculated in a specific tight-binding model with time-reversal symmetry. Specifically, a tight-…
Seebeck effect of Dirac electrons
Junji Fujimoto, Masao Ogata
We study the Seebeck effect in the three-dimensional Dirac electron system based on the linear response theory with Luttinger's gravitational potential. The Seebeck coefficient …
Spin-charge conversion and current vortex in spin-orbit coupled systems
Junji Fujimoto, Florian Lange, Satoshi Ejima +4
Using response theory, we calculate the charge-current vortex generated by spin pumping at a point-like contact in a system with Rashba spin-orbit coupling. We discuss the spatial…
Generation of current vortex by spin current in Rashba systems
Florian Lange, Satoshi Ejima, Junji Fujimoto +4
Employing unbiased large-scale time-dependent density-matrix renormalization-group simulations, we demonstrate the generation of a charge-current vortex via spin injection in the R…
Adiabatic and Nonadiabatic Spin-transfer Torques in Antiferromagnets
Junji Fujimoto
Electron transport in magnetic orders and the magnetic orders dynamics have a mutual dependence, which provides the key mechanisms in spin-dependent phenomena. Recently, antiferrom…
Magnon Current Generation by Dynamical Distortion
Junji Fujimoto, Mamoru Matsuo
The interaction between spin and nanomechanical degrees of freedom attracts interest from the viewpoint of basic science and device applications. We study the magnon current induce…
Valley-dependent spin transport in monolayer transition-metal dichalcogenides
Yuya Ominato, Junji Fujimoto, Mamoru Matsuo
We study valley-dependent spin transport theoretically in monolayer transition-metal dichalcogenides in which a variety of spin and valley physics are expected because of spin-vall…
Alternating Current-induced Interfacial Spin-transfer Torque
Junji Fujimoto, Mamoru Matsuo
We investigate an interfacial spin-transfer torque and -term torque with alternating current (AC) parallel to a magnetic interface. We find that both torques are resonantly enha…
Determination of spin relaxation time and spin diffusion length by oscillation of spin pumping signal
Junji Fujimoto, Mamoru Matsuo
We theoretically investigate a manipulation method of nonequilibrium spin accumulation in the paramagnetic normal metal of a spin pumping system, by using the spin precession motio…
Non-local Spin-charge Conversion via Rashba Spin-Orbit Interaction
Junji Fujimoto, Gen Tatara
We show theoretically that conversion between spin and charge by spin-orbit interaction in metals occurs even in a non-local setup where magnetization and spin-orbit interaction ar…
Transport Coefficients of Dirac Ferromagnet: Effects of Vertex Corrections
Junji Fujimoto
As a strongly spin-orbit coupled metallic model with ferromagnetism, we have considered an extended Stoner model to the relativistic regime, named Dirac ferromagnet in three dimens…
Intrinsic and Extrinsic Spin Hall Effects of Dirac Electrons
Takaaki Fukazawa, Hiroshi Kohno, Junji Fujimoto
We investigate the spin Hall effect (SHE) of electrons described by the Dirac equation, which is used as an effective model near the -points in bismuth. By considering short-ran…
Transport Properties of Dirac Ferromagnet
Junji Fujimoto, Hiroshi Kohno
We propose a model ferromagnet based on the Dirac Hamiltonian in three spatial dimensions, and study its transport properties which include anisotropic magnetoresistance (AMR) and…