1 citations · 3 across the 12 of their papers we have counts for
13 papers
Ferroaxial Electronic Response to Local Lattice Rotation
Ken Uchino, Yuuki Ogawa, Satoru Hayami
We theoretically investigate electronic responses to lattice deformation in a ferroaxial system using a tight-binding model on a two-dimensional square lattice and linear response…
Spin-Point-Group Classification of Multipoles for Nonrelativistic Collinear Magnets
Yuuki Ogawa, Satoru Hayami
Multipole moments provide a unified symmetry language for describing electronic degrees of freedom and their associated physical responses. Although active multipoles have been sys…
Finite-size effects and interaction-driven crossovers in quarter-filled attractive Hubbard model: Exact diagonalization, DMRG and machine-learning analysis
Md Fahad Equbal, M. A. H. Ahsan, Satoru Hayami
We investigate the quarter-filled attractive Hubbard model on finite-width cylindrical lattices using exact diagonalization (ED), density-matrix renormalization group (DMRG) and un…
Spatially Dispersive Second-Harmonic Generation in Ferroaxial Systems
Takumi Shiro, Satoru Hayami
Spatially dispersive second-harmonic generation (SHG) provides a powerful probe of centrosymmetric multipolar states beyond the electric-dipole approximation. We develop a gauge-co…
Magnetic quadrupole current generation and accumulation in noncentrosymmetric systems
Yuuga Takasu, Satoru Hayami
Magnetization control via magnetic octupole injection has recently been proposed for a new class of centrosymmetric antiferromagnets, namely -wave altermagnets, where the magnet…
Sixteenfold Classification of Many-Body Multipoles from Rotation-Compatible Canonical Symmetries
Shingo Kuniyoshi, Rikuto Oiwa, Satoru Hayami
The conventional multipole framework provides a standard symmetry-based language for one-body electronic degrees of freedom, but fails to distinguish physically distinct sectors in…
Piezoaxial coupling for strain-selected ferroaxial domain control
Rikuto Oiwa, Satoru Hayami
We formulate a symmetry-based hierarchy of strain-derived conjugate fields for ferroaxial order, and demonstrate strain-selected ferroaxial domain control using first-principles ca…
Effective phonon models based on symmetry-adapted multipole basis -- Hidden chiral phonon angular momentum splitting in ferroaxial systems
Yu Xie, Rikuto Oiwa, Satoru Hayami
We propose a symmetry-based framework for constructing effective harmonic phonon models using a symmetry-adapted multipole basis. By decomposing the force-constant matrix into bond…
Theory of Many-Body Multipole Operators in Single-Centered Electron Systems: Two-Body Toroidal Monopoles in Spinless Orbitals
Shingo Kuniyoshi, Rikuto Oiwa, Satoru Hayami
One-body multipole operators are defined as irreducible representations of rotational symmetry together with spatial-inversion and time-reversal symmetries, providing a systematic…
Antiparallel spin polarizations as quadratic response in chiral systems
Akane Inda, Kohei Hattori, Hiroaki Kusunose +1
Chirality-dependent spin generation has attracted considerable attention in condensed matter physics. In this paper, we theoretically investigate antiparallel spin polarization as…
Nonrelativistic Functional Properties in Collinear Antiferromagnets Based on Multipole Representation Theory
Yuuki Ogawa, Satoru Hayami
In recent years, the concept of multipoles has been widely used to describe and classify various magnetic and electric responses in solids, providing a systematic way to identify s…
Symmetry classification of magnetic octupole current based on multipole representation theory
Yuuga Takasu, Satoru Hayami
Magnetic octupole (MO) currents have recently attracted significant attention as a driving force for the Neel vector dynamics in d-wave altermagnets, a new class of antiferromagnet…
Analysis of Spin Current Generation by Elastic Waves in -wave Altermagnets
Ken Uchino, Yuuki Ogawa, Satoru Hayami
We theoretically investigate the mechanism of spin current generation induced by elastic waves in nonrelativistic magnets referred to as altermagnets. By analyzing an -wave alte…