Enhancement of super-exchange pairing in the periodically-driven Hubbard model

J. Coulthard, S. R. Clark, S. Al-Assam, A. Cavalleri, D. Jaksch

OAI: oai:purehost.bath.ac.uk:openaire_cris_publications/84ee6640-0371-4b57-bcc5-0b25d3139009 • DOI: https://doi.org/10.1103/PhysRevB.96.085104

We show that periodic driving can enhance electron pairing in strongly-correlated systems. Focusing on the strong-coupling limit of the doped Hubbard model we investigate in-gap, spatially inhomogeneous, on-site modulations and demonstrate that they substantially reduce electronic hopping without suppressing super-exchange interactions and pair hopping. We calculate real-time dynamics for the one-dimensional case, starting from zero and finite temperature initial states, and show that enhanced singlet-pair correlations emerge quickly and robustly in the out-of-equilibrium many-body state. Our results reveal a fundamental pairing mechanism that might underpin optically induced superconductivity in some strongly correlated quantum materials.

cond-mat.quant-gas