Floquet topological superconductivity induced by chiral many-body interaction

Abstract Non-equilibrium engineering is becoming a seminal way for realising novel quantum phases that are unimaginable in equilibrium. In particular, Floquet theory applied to mechanics revealed we can even control the band topology semimetallic/insulating systems, while straightforward application topological superconductivity fails typical superconductors because supercondicting gap function does not couple electromagnetic field direct manner. Here show overcome this difficulty by taking account of correlation effects. Namely, study how d -wave changed when illuminated circularly-polarised light (CPL) repulsive Hubbard model strong-coupling regime. We adopt formalism Gutzwiller-projected effective Hamiltonian with time-periodic Schrieffer-Wolff transformation. find CPL induces + i pairing, which arises from chiral spin coupling and three-site term generated CPL. The latter remains significant low frequencies intensities This clearly reflected obtained phase diagram against laser intensity temperature various red-detuned U , transient dynamics also examined. phenomenon here open novel, dynamical induce superconductivity.