Mechanism of unconventional superconductivity induced by skyrmion excitations in two-dimensional strongly correlated electron systems

Abstract

We propose a mechanism of unconventional superconductivity in two-dimensional strongly correlated electron systems. We consider a two-dimensional Kondo lattice system or double exchange system with spin-orbit coupling arising from buckling of the plane. We show that a Chern-Simons term is induced for a gauge field describing the phase fluctuations of the localized spins. Through the induced Chern-Simons term, carriers behave like skyrmion excitations that lead to a destruction mechanism of magnetic long-range order by carrier doping. After magnetic long-range order is destroyed by carrier doping, the Chern-Simons term plays a dominant role and the attractive interaction between skyrmions leads to unconventional superconductivity. For the case of the ferromagnetic interaction between the localized spins, the symmetry of the Cooper pair is p wave (px±ipy). For the case of the antiferromagnetic interaction between the localized spins, the symmetry of the Cooper pair is d wave (dx2−y2). Applications to various systems are discussed, in particular to the high-Tc cuprates.

Source-reported materials — not catalogue approval

Similar papers