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cond-mat.supr-con2026
Strain-Induced Helical Superconductivity and the Zero-Field Diode Effect
Raigo Nagashima, Jörg Schmalian
Motivated by the strain-induced zero-field superconducting diode effect observed in PbTaSe, we identify a mechanism by which strain generates nonreciprocal superconducting tran…
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…