Zobrazeno 1 - 10
of 110
pro vyhledávání: '"Fujimoto, Junji"'
We investigate the intrinsic spin Nernst effect (SNE), a transverse spin current induced by temperature gradients, in topological Dirac semimetals (TDSMs) and magnetic Weyl semimetals (MWSMs) with Ising spin-orbit coupling. The intrinsic SNE is descr
Externí odkaz:
http://arxiv.org/abs/2409.13225
We present the microscopic theory of the spin Nernst effect, which is a transverse spin current directly induced by a temperature gradient, employing the linear response theory with Luttinger's gravitational potential method. We consider a generic, n
Externí odkaz:
http://arxiv.org/abs/2406.02932
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 ferromagnetism. The energy bands of the Dirac Hamiltonian are split after in
Externí odkaz:
http://arxiv.org/abs/2308.02336
Electron hydrodynamics is currently known to emerge only when electron-electron interaction dominates over the momentum-nonconserving scatterings of electrons, where the electron transport is described by a hydrodynamic equation. Here we show that el
Externí odkaz:
http://arxiv.org/abs/2303.17234
Autor:
Fujimoto, Junji
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 examine the field theoretical approach to current-induced spin-transf
Externí odkaz:
http://arxiv.org/abs/2208.09581
Autor:
Chi, Zhendong, Qu, Guanxiong, Lau, Yong-Chang, Kawaguchi, Masashi, Fujimoto, Junji, Takanashi, Koki, Ogata, Masao, Hayashi, Masamitsu
Publikováno v:
Phys. Rev. B 105, 214419 (2022)
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 definition of spin current. All components of the spin Hall conductivity v
Externí odkaz:
http://arxiv.org/abs/2205.11669
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-binding model with time-reversal symmetry is constructed with chiral h
Externí odkaz:
http://arxiv.org/abs/2204.03263
Autor:
Fujimoto, Junji, Ogata, Masao
Publikováno v:
J. Phys. Soc. Jpn. 91, 054603 (2022)
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 $S$ is defined by $S = L_{12} / L_{11} T$, where $T$ is the temperature,
Externí odkaz:
http://arxiv.org/abs/2106.04050
Autor:
Fujimoto, Junji, Lange, Florian, Ejima, Satoshi, Shirakawa, Tomonori, Fehske, Holger, Yunoki, Seiji, Maekawa, Sadamichi
Publikováno v:
APL Materials 9, 060904 (2021)
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 profile of the current density for finite temperature and for the zero
Externí odkaz:
http://arxiv.org/abs/2103.06540
Autor:
Lange, Florian, Ejima, Satoshi, Fujimoto, Junji, Shirakawa, Tomonori, Fehske, Holger, Yunoki, Seiji, Maekawa, Sadamichi
Publikováno v:
Phys. Rev. Lett. 126, 157202 (2021)
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 Rashba system. The spin current is polarized perpendicular to the syste
Externí odkaz:
http://arxiv.org/abs/2011.08574