72 citations · 571 across the 35 of their papers we have counts for
35 papers
Intrinsic spin Nernst effect in topological Dirac and magnetic Weyl semimetals
Taiki Matsushita, Akihiro Ozawa, Yasufumi Araki +2
We investigate the intrinsic spin Nernst effect (SNE), a transverse spin current induced by temperature gradients, in topological Dirac semimetals (TDSMs) and magnetic Weyl semimet…
Topological Spin-Orbit Torque in Ferrimagnetic Weyl Semimetal
Tomonari Meguro, Akihiro Ozawa, Koji Kobayashi +2
The spin-orbit torque (SOT) in a compensated ferrimagnetic Weyl semimetal, , is studied by the linear response theory. We elucidate that the SOT driven by a…
Chiral gauge field in fully-spin polarized Weyl semimetal with magnetic domain walls
Akihiro Ozawa, Yasufumi Araki, Kentaro Nomura
Modulation of magnetization in magnetic Weyl semimetals leads to the shift of Weyl points in momentum space, which effectively serves as the chirality-dependent gauge field for the…
Emergent electric field induced by current-driven domain wall motion in a room-temperature antiferromagnet FeSn2
Tomoyuki Yokouchi, Yuta Yamane, Yasufumi Araki +2
Antiferromagnets have attracted extensive interest as platforms for nanoscale spintronic devices owing to ultrafast spin dynamics and lack of a stray field. One of the crucial miss…
Emergence of inductance and capacitance from topological electromagnetism
Yasufumi Araki, Jun'ichi Ieda
Topological electromagnetism owing to nontrivial momentum-space topology of electrons in insulators gives rise to diverse anomalous magnetoelectric responses. While conventional in…
Magnetic orderings from spin-orbit coupled electrons on kagome lattice
Jin Watanabe, Yasufumi Araki, Koji Kobayashi +2
We investigate magnetic orderings on kagome lattice numerically from the tight-binding Hamiltonian of electrons, governed by the filling factor and spin-orbit coupling (SOC) of ele…
Heavy-quark spin polarization induced by the Kondo effect in a magnetic field
Daiki Suenaga, Yasufumi Araki, Kei Suzuki +1
We propose a new mechanism of the heavy-quark spin polarization (HQSP) in quark matter induced by the Kondo effect under external magnetic field. The Kondo effect is caused by a co…
Nodal lines and boundary modes in topological Dirac semimetals with magnetism
Yasufumi Araki, Jin Watanabe, Kentaro Nomura
Nodal-line semimetals with magnetic orders have been theoretically predicted and experimentally observed in only few compounds. We theoretically explore the electronic structure in…
Intrinsic torques emerging from anomalous velocity in magnetic textures
Yasufumi Araki, Jun'ichi Ieda
Momentum-space topology of electrons under strong spin-orbit coupling contributes to the electrically induced torques exerting on magnetic textures insensitively to disorder or the…
Long-range spin transport on the surface of topological Dirac semimetal
Yasufumi Araki, Takahiro Misawa, Kentaro Nomura
We theoretically propose the long-range spin transport mediated by the gapless surface states of topological Dirac semimetal (TDSM). Low-dissipation spin current is a building bloc…
Magnetization energy current in the axial magnetic effect
Atsuo Shitade, Yasufumi Araki
The axial magnetic effect (AME) is one of the anomalous transport phenomena in which the energy current is induced by an axial magnetic field. Here, we numerically study the AME fo…
Chiral separation effect catalyzed by heavy impurities
Daiki Suenaga, Yasufumi Araki, Kei Suzuki +1
We investigate the influence of Kondo effect, namely, the nonperturbative effect induced by heavy impurities, on the chiral separation effect (CSE) in quark matter. We employ a sim…
Spin-orbital magnetic response of relativistic fermions with band hybridization
Yasufumi Araki, Daiki Suenaga, Kei Suzuki +1
Spins of relativistic fermions are related to their orbital degrees of freedom. In order to quantify the effect of hybridization between relativistic and nonrelativistic degrees of…
Two relativistic Kondo effects: Classification with particle and antiparticle impurities
Yasufumi Araki, Daiki Suenaga, Kei Suzuki +1
We investigate two different types of relativistic Kondo effects, distinguished by heavy-impurity degrees of freedom, by focusing on the energy-momentum dispersion relations of the…
Kondo effect driven by chirality imbalance
Daiki Suenaga, Kei Suzuki, Yasufumi Araki +1
We propose a novel mechanism of the Kondo effect driven by a chirality imbalance (or chiral chemical potential) of relativistic light fermions. This effect is realized by the mixin…
Dynamical spin-to-charge conversion on the edge of quantum spin Hall insulator
Yasufumi Araki, Takahiro Misawa, Kentaro Nomura
We theoretically manifest that the edge of a quantum spin Hall insulator (QSHI), attached to an insulating ferromagnet (FM), can realize a highly efficient spin-to-charge conversio…
Magnetic textures and dynamics in magnetic Weyl semimetals
Yasufumi Araki
Recent theoretical and experimental attemps have been successful in finding magnetic Weyl semimetal phases, which show both nodal-point structure in the electronic bands and magnet…
Localized charge in various configurations of magnetic domain wall in Weyl semimetal
Yasufumi Araki, Akihide Yoshida, Kentaro Nomura
We numerically investigate the electronic properties of magnetic domain walls formed in a Weyl semimetal. Electric charge distribution is computed from the electron wave functions,…
Strain-induced nonlinear spin Hall effect in topological Dirac semimetal
Yasufumi Araki
We show that an electric field applied to a strained topological Dirac semimetal, such as Na3Bi and Cd3As2, induces a spin Hall current that is quadratic in the electric field. By…
Charge pumping induced by magnetic texture dynamics in Weyl semimetals
Yasufumi Araki, Kentaro Nomura
Spin-momentum locking in Weyl semimetals correlates the orbital motion of electrons with background magnetic textures. We show here that the dynamics of a magnetic texture in a mag…
Skyrmion-induced anomalous Hall conductivity on topological insulator surfaces
Yasufumi Araki, Kentaro Nomura
Electron spin-momentum locking together with background magnetic textures can significantly alter the electron transport properties. We theoretically investigate the electron trans…
Microscopic theory of electrically induced spin torques in magnetic Weyl semimetals
Daichi Kurebayashi, Kentaro Nomura
We theoretically study electrical responses of magnetization in Weyl semimetals. The Weyl semimetal is a new class of topological semimetals, possessing hedgehog type spin textures…
Universal charge and current on magnetic domain walls in Weyl semimetals
Yasufumi Araki, Akihide Yoshida, Kentaro Nomura
Domain walls in three-dimensional Weyl semimetals, formed by localized magnetic moments, are investigated. There appear bound states around the domain wall with the discrete spectr…
Spin textures and spin-wave excitations in doped Dirac-Weyl semimetals
Yasufumi Araki, Kentaro Nomura
We study correlations and magnetic textures of localized spins, doped in three-dimensional Dirac semimetals. An effective field theory for magnetic moments is constructed by integr…