11 papers
Double-twisted surface spectrum from hybridized Majorana Kramers pairs and wallpaper fermions
Kaito Yoda, Ai Yamakage
We theoretically investigate the superconducting surface states of wallpaper fermions, which are surface quasiparticles of topological nonsymmorphic crystalline insulators protecte…
Quantum Geometric Origin of Hall Viscosity and Nonlocal Hall Conductivity in Lattice Bands
Danyu Shu, Ryotaro Sano, Ai Yamakage +2
We show that Hall viscosity in lattice bands is governed by a band-projected electric quadrupole encoded within the quantum geometry: Berry curvature sets the projected-coordinate…
Gyromagnetic Quantum Friction in Rayleigh Vorticity Baths
Mamoru Matsuo, Ryotaro Sano, Ai Yamakage +2
We identify an intrinsic zero-temperature relaxation channel for near-surface spins gyromagnetically coupled to Rayleigh-wave vorticity. This surface-mode contribution requires no…
Thermoelectric enhancement from an asymmetric spectral-conductivity cusp in spin-1 chiral fermions
Risako Kikuchi, Junya Endo, Ai Yamakage
A recent study showed that, in spin-1 chiral fermion systems composed of two linearly dispersing bands and one trivial band, impurity scattering produces an asymmetric cusp in the…
Generalized continuum theory of phonon angular momentum in crystals
Mamoru Matsuo, Naoki Nishimura, Ai Yamakage +1
We formulate a generalized continuum theory of phonon angular momentum in crystals by introducing a local SO(3) material frame in addition to the macroscopic displacement field. Th…
Ferromagnetic resonance modulation in topological materials with bulk--boundary coexistence
Shun Muto, Yuya Ominato, Takeo Kato +2
We extend ferromagnetic resonance (FMR) modulation theory to describe systems in which bulk and boundary states of topological materials coexist, with both appearing at the same en…