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Q: Fachverband Quantenoptik und Photonik

Q 66: Ultracold Matter (Fermions) II (joint session Q/A)

Q 66.1: Invited Talk

Friday, March 14, 2025, 11:00–11:30, HS V

Enhancing pair tunneling in the Hubbard model by Floquet engineering — •Andrea Bergschneider — Physikalisches Institut, University of Bonn, Bonn, Germany

The Fermi-Hubbard model has been very successful in describing quantum phases that emerge from the interplay between single-particle tunneling and on-site interaction. The simulation of phenomena in solid state systems, however, often requires additional coupling terms, such as explicit pair tunneling, which is exponentially suppressed in the simple Hubbard model.

We extend our optical lattice by a superlattice to go beyond the simple Fermi-Hubbard model. By time-periodic modulation of the system, we engineer an effective Hamiltonian with sizable explicit pair tunneling [1]. In our scheme suppresses single-particle tunneling while simultaneously realizing an effectively interacting systems tunable from a regime with density-assistant tunneling to pair tunneling. These findings may bring the realization of novel quantum phases based on pairing mechanisms within reach.

[1] Klemmer et al., arXiv 2404.08482, accepted in Phys. Rev. Lett.

Keywords: Optical lattices; Fermions; Hubbard model; Floquet engineering; Quantum simulation