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…