259 citations · 1.9k across the 61 of their papers we have counts for
61 papers
Valley Hall Viscosity in Gapped Graphene with and without a Magnetic Field
Danyu Shu, Hiroshi Funaki, Ai Yamakage +2
Hall viscosity is conventionally defined through the stress response to time-dependent strain, a perturbation that is difficult to implement in solid-state experiments. We formulat…
Superconducting Gap Structures in Wallpaper Fermion Systems
Kaito Yoda, Ai Yamakage
We theoretically investigate the superconducting gap structures in wallpaper fermions, which are surface states of topological nonsymmorphic crystalline insulators, based on a two-…
Symmetry-adapted models for multifold fermions with spin-orbit coupling
Koki Satow, Ai Yamakage
Multifold fermions, quasiparticles with multiple degeneracy protected by crystalline symmetries, exhibit a variety of intriguing phenomena stemming from their large topological cha…
Spin Pumping into two-dimensional systems
Yuya Ominato, Masaki Yama, Ai Yamakage +2
In this review, we present recent theoretical developments on spin transport phenomena probed by ferromagnetic resonance (FMR) modulation in two-dimensional systems coupled to magn…
Magnon-mediated superconductivity on ferromagnetic wallpaper fermions
Koki Mizuno, Ai Yamakage
We study two-dimensional superconductivity mediated by magnetic fluctuations at the interface between a ferromagnetic insulator and the nonsymmorphic topological crystalline insula…
Directional propagation of quantum Hall viscous fluid by nano-structural engineering
Hiroshi Funaki, Ai Yamakage, Ryotaro Sano +1
We present a microscopic theory of the viscous electron fluid in the quantum Hall state based on the nonequilibrium Green's function method and the von Neumann lattice representati…
Dynamical Majorana Ising spin response in a topological superconductor-magnet hybrid by microwave irradiation
Yuya Ominato, Ai Yamakage, Mamoru Matsuo
We study a dynamical spin response of surface Majorana modes in a topological superconductor-magnet hybrid under microwave irradiation. We find a method to toggle between dissipati…
Hall effect of ferro/antiferromagnetic wallpaper fermions
Koki Mizuno, Ai Yamakage
Nonsymmorphic crystals can host characteristic double surface Dirac cones with fourfold degeneracy on the Dirac points, called wallpaper fermion, protected by wallpaper group symme…
Microscopic Theory of Nonlinear Hall Effect Induced by Electric Field and Temperature Gradient
Terufumi Yamaguchi, Kazuki Nakazawa, Ai Yamakage
Electric current flows parallel to the outer product of an applied electric field and temperature gradient, a phenomenon we call the nonlinear chiral thermo-electric (NCTE) Hall ef…
Electrical conductivity and screening effect of spin-1 chiral fermions scattered by charged impurities
Risako Kikuchi, Ai Yamakage
We theoretically study the quantum transport in a three-dimensional spin-1 chiral fermion system in the presence of coulomb impurities based on the self-consistent Born approximati…
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…
Anisotropic spin-current spectroscopy of ferromagnetic superconducting gap symmetries
Hiroshi Funaki, Ai Yamakage, Mamoru Matsuo
We develop a microscopic theory of tunneling spin transport at the magnetic interface between a ferromagnetic insulator and a ferromagnetic superconductor (FSC) driven by ferromagn…
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…
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…
Ferromagnetic resonance modulation in -wave superconductor/ferromagnetic insulator bilayer systems
Yuya Ominato, Ai Yamakage, Takeo Kato +1
We investigate ferromagnetic resonance (FMR) modulation in -wave superconductor (SC)/ferromagnetic insulator (FI) bilayer systems theoretically. The modulation of the Gilbert da…
Giant Peltier Conductivity in an Uncompensated Semimetal Ta2PdSe6
Akitoshi Nakano, Ai Yamakage, Urara Maruoka +3
Thermoelectric properties of single crystal Ta2PdSe6 is investigated by means of transport measurements, and a density functional calculation. We found a giant Peltier conductivity…
Theory of Magnetic-Texture-Induced Anomalous Hall Effect on the Surface of Topological Insulators
Terufumi Yamaguchi, Ai Yamakage
The anomalous Hall effect is caused by magnetic textures such as skyrmions. We derive an analytical formula of the Hall conductivity on the surface of a topological insulator up to…
Electric Multipoles of Double Majorana Kramers Pairs
Yuki Yamazaki, Shingo Kobayashi, Ai Yamakage
A single Majorana Kramers pair hosts only one component of the magnetic multipole. This can be used to determine the bulk Cooper-pair symmetry through surface-sensitive spectroscop…
Anisotropic superconducting spin transport at magnetic interfaces
Yuya Ominato, Ai Yamakage, Mamoru Matsuo
We present a theoretical investigation of anisotropic superconducting spin transport at a magnetic interface between a p-wave superconductor and a ferromagnetic insulator. Our form…
Majorana multipole response: General theory and application to wallpaper groups
Shingo Kobayashi, Yuki Yamazaki, Ai Yamakage +1
Whereas identification of Cooper pair symmetry is the first and crucial step in the investigation of unconventional superconductors, only a few have been established so far because…
Magnetic response of Majorana Kramers pairs with an order-two symmetry
Yuki Yamazaki, Shingo Kobayashi, Ai Yamakage
We study an intrinsic relation between the topology of bulk electronic states and magnetic responses of Majorana Kramers pairs, Kramers pairs of Majorana fermions, on a surface of…
High-Mobility Carriers Induced by Chemical Doping in the Candidate Nodal-Line Semimetal CaAgP
Yoshihiko Okamoto, Kazushige Saigusa, Taichi Wada +7
We report the electronic properties of single crystals of candidate nodal-line semimetal CaAgP. The transport properties of CaAgP are understood within the framework of a hole-dope…