Magnon Mediated Fulde–Ferrell–Larkin–Ovchinnikov Phase in Ferromagnetic Heterostructures

Jian-Lin Li^1*, Chien-Te Wu¹

¹Department of Electrophysics, National Chiao Tung University, Hsinchu 30010, Taiwan

* Presenter:Jian-Lin Li, email:jak831031@gmail.com

Our work focuses on how the coupling in a ferromagnetic heterostructure formed by a 2D ferromagnetic insulator (FI) on the top of a 2D normal metal (NM) produces the possible candidate of Fulde-Ferrell-Larkin-Ovchinnikov phase. Assume both materials have the same lattice structure which is square lattice and there exists exchange coupling via magnon and electron at the intersurface between FI and NM. Due to the symmetry of lattice and the interaction breaking the spin degeneracy of electron’s dispersions, we reasonably conjecture that if the electrons in normal metal can form the Cooper pairing and condense then it should be with nonzero total momentum which is the well-known FFLO pairing. Therefore we use mean field method to derive the gap equation and use it to check whether the system have condensation corresponding to FFLO state.

Keywords: Strong Correlated system, Superconductivity, Magnon, FFLO phase