6 papers
Thermodynamic Electric Toroidal Dipole and Intrinsic Longitudinal Spin Transport
Taisei Yamanaka, Takumi Sato, Satoru Hayami
Electric toroidal dipoles (ETDs) characterize ferroaxial order, yet their bulk definition in periodic crystals has remained elusive because conventional multipole operators involve…
Magnetic toroidal monopoles from relativistic polarization responses to magnetic field gradients
Taisei Yamanaka, Takumi Sato, Satoru Hayami
The magnetic toroidal monopole, a time-reversal-odd scalar, has attracted attention through its characteristic responses, such as electric-field-induced nonreciprocal directional d…
Thermodynamic Multipoles and Dissipative Conductivities in Metallic Systems
Takumi Sato, Satoru Hayami
Multipoles provide a systematic framework for describing the electronic structures of quantum materials from a symmetry perspective. Thermodynamic multipole moments in crystalline…
Orbital magnetic octupole in crystalline solids and characterization of orbital altermagnetism
Takumi Sato, Satoru Hayami
Magnetic multipole moments beyond dipoles have emerged as key descriptors of unconventional electromagnetic responses in crystalline solids. However, a gauge-invariant bulk express…
Quantum theory of magnetic octupole in periodic crystals and application to -wave altermagnets
Takumi Sato, Satoru Hayami
Magnetic multipoles have been recognized as order parameters characterizing magnetic structure in solids. Recently, magnetic octupoles have been proposed as the order parameters of…
Finite-momentum superconducting states due to odd-frequency Cooper pairing correlations
Takumi Sato, Satoru Hayami, Shingo Kobayashi +1
This paper discusses the origin of a nonuniform superconducting state in which Cooper pairs have a small but finite center-of-mass momentum. We analyze the instability of the norma…