3 papers
cond-mat.supr-con2026
Type II Lifshitz invariant and optically active Higgs mode in time-reversal symmetry broken superconductors
Raigo Nagashima, Chihiro Mamiya, Naoto Tsuji
Lifshitz invariant is a symmetry-allowed term in the Ginzburg-Landau free energy of an ordered phase, involving the order parameters and a single spatial derivative, which serves a…
cond-mat.mes-hall2026
Hall effect in topologically trivial isolated flat-band systems
Raigo Nagashima, Masao Ogata, Naoto Tsuji
We study the Hall effect in topologically trivial isolated flat-band systems (i.e., flat bands are separated from other bands and have zero Chern number) for a weak magnetic field.…
cond-mat.supr-con2025
Optically active Higgs and Leggett modes in multiband pair-density-wave superconductors with Lifshitz invariant
Raigo Nagashima, Titouan Mouilleron, Naoto Tsuji
Lifshitz invariant is a symmetry invariant composed of multiple order parameters that contain a single spatial derivative in a Ginzburg-Landau (GL) free energy, which may induce a…